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Periodically validate existing mail server configs #135

@tdulcet

Description

@tdulcet

I wrote a Python script to validate all of the existing mail server configs. It should complete the "Mail server reachable and speaks protocol" from #4 (comment).

I found a few common issues affecting multiple config files:

  • Many of the SMTP configs still use port 25, which is typically blocked by residential ISPs, resulting in timeout errors.
  • Some of the servers only support SSLv3 or other obsolete encryption, which has not been supported by Thunderbird for many years.
  • Some of the configs still specify no encryption.

The configs for educa.madrid.org, elpasotel.net, goo.jp, gransy.com, mnet.ne.jp, pdx.edu and studenti.univr.it are unusable, as all of the listed servers are either unreachable or have SSL errors.

Automated validation would be much more difficult to implement, as several of the servers have very strict rate limiting or do IP address checks, so any results would be noisy. For example, webhuset.no shows timeout errors in the below results, but worked as expected when run from a different network, while the reverse happened with charter.net. However, this script could still be run periodically to find outdated existing configs, as well as to check proposed new config files.

The script does get the capabilities from each server, so it could also for example be used to complete the "Check whether SSL is offered" (at least for StartTLS) and "Check whether encrypted passwords are offered" from the list in #4. Note that some of the POP3 servers do not support the needed CAPA command, so this may require some guess and check.

Click here to see the full results for all 153 existing config files
126.com
        126.com
        IMAP    ✅      'imap.126.com':993  SSL/TLS
        SMTP    ✅      'smtp.126.com':465  SSL/TLS
163.com
        163.com
        IMAP    ✅      'imap.163.com':993  SSL/TLS
        SMTP    ✅      'smtp.163.com':465  SSL/TLS
1und1.de
        1&1
        IMAP    ✅      'imap.1und1.de':993  SSL/TLS
        IMAP    ✅      'imap.1und1.de':143  StartTLS
        POP3    ✅      'pop.1und1.de':995  SSL/TLS
        POP3    ✅      'pop.1und1.de':110  StartTLS
        SMTP    ✅      'smtp.1und1.de':465  SSL/TLS
        SMTP    ✅      'smtp.1und1.de':587  StartTLS
a1.net
        a1.net
        IMAP    ✅      'securemail.a1.net':993  SSL/TLS
        SMTP    ✅      'securemail.a1.net':587  StartTLS
active24.com
        ACTIVE 24 Webhosting
        IMAP    ✅      'email.active24.com':993  SSL/TLS
        POP3    ✅      'email.active24.com':995  SSL/TLS
        SMTP    ✅      'email.active24.com':465  SSL/TLS
alice.it
        Alice Italy
        IMAP    ✅      'in.alice.it':143  StartTLS
        POP3    ✅      'in.alice.it':110  StartTLS
        SMTP    ❌ ([SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1000))   'out.alice.it':587  StartTLS
aol.com
        AOL Mail
        IMAP    ✅      'imap.aol.com':993  SSL/TLS
        POP3    ✅      'pop.aol.com':995  SSL/TLS
        SMTP    ✅      'smtp.aol.com':465  SSL/TLS
arubapec.it
        Aruba PEC
        IMAP    ✅      'imaps.pec.aruba.it':993  SSL/TLS
        POP3    ❌ (timed out)  'pop3s.pec.aruba.it':993  SSL/TLS
        SMTP    ✅      'smtps.pec.aruba.it':465  SSL/TLS
att.net
        AT&T
        POP3    ✅      'inbound.att.net':995  SSL/TLS
        SMTP    ✅      'outbound.att.net':465  SSL/TLS
bay.wind.ne.jp
        群馬インターネット
        POP3    ✅      'bay.wind.ne.jp':110  None
        SMTP    ✅      'bay.wind.ne.jp':587  None
bb-niigata.jp
        BBにいがた
        POP3    ✅      'pop.bb-niigata.jp':110  None
        SMTP    ❌ (timed out)  'pop.bb-niigata.jp':25  None
bell.net
        Bell Canada email
        IMAP    ✅      'imap.bell.net':993  SSL/TLS
        POP3    ✅      'pophm.sympatico.ca':995  SSL/TLS
        SMTP    ✅      'smtphm.sympatico.ca':587  StartTLS
biglobe.ne.jp
        Biglobe
        POP3    ✅      'mail.biglobe.ne.jp':995  SSL/TLS
        SMTP    ✅      'mail.biglobe.ne.jp':465  SSL/TLS
bigpond.com
        Telstra Mail
        IMAP    ✅      'imap.telstra.com':993  SSL/TLS
        POP3    ✅      'pop.telstra.com':995  SSL/TLS
        SMTP    ✅      'smtp.telstra.com':465  SSL/TLS
bluewin.ch
        Bluewin Mail
        IMAP    ✅      'imaps.bluewin.ch':993  SSL/TLS
        POP3    ✅      'pop3s.bluewin.ch':995  SSL/TLS
        SMTP    ✅      'smtpauths.bluewin.ch':465  SSL/TLS
blueyonder.co.uk
        Blueyonder: Virgin Media Mail
        IMAP    ✅      'imap4.blueyonder.co.uk':993  SSL/TLS
        POP3    ✅      'pop3.blueyonder.co.uk':995  SSL/TLS
        SMTP    ✅      'smtp.blueyonder.co.uk':465  SSL/TLS
bol.com.br
        BOL - Brasil Online
        IMAP    ✅      'imap.bol.com.br':993  SSL/TLS
        POP3    ✅      'pop3.bol.com.br':995  SSL/TLS
        SMTP    ✅      'smtps.bol.com.br':465  SSL/TLS
        SMTP    ✅      'smtps.bol.com.br':587  StartTLS
broba.cc
        ぷらら
        POP3    ✅      'mail.broba.cc':110  None
        SMTP    ❌ ([Errno 111] Connection refused)     'mail.broba.cc':587  None
btinternet.com
        BT Mail
        IMAP    ✅      'mail.btinternet.com':993  SSL/TLS
        POP3    ✅      'mail.btinternet.com':995  SSL/TLS
        SMTP    ✅      'mail.btinternet.com':465  SSL/TLS
cc9.ne.jp
        CC9インターネットサービス
        IMAP    ❌ ([SSL: DH_KEY_TOO_SMALL] dh key too small (_ssl.c:1000))     'pop.cc9.ne.jp':993  SSL/TLS
        POP3    ❌ ([SSL: DH_KEY_TOO_SMALL] dh key too small (_ssl.c:1000))     'pop.cc9.ne.jp':995  SSL/TLS
        SMTP    ✅      'msa.cc9.ne.jp':465  SSL/TLS
cek.ne.jp
        エコーシティー・駒ケ岳
        IMAP    ❌ (timed out)  'imap.cek.ne.jp':993  SSL/TLS
        POP3    ❌ ([SSL: DH_KEY_TOO_SMALL] dh key too small (_ssl.c:1000))     'mail.cek.ne.jp':995  SSL/TLS
        SMTP    ✅      'smtpa.cek.ne.jp':465  SSL/TLS
centurylink.net
        CenturyLink.net
        IMAP    ❌ (The read operation timed out)       'mail.centurylink.net':993  SSL/TLS
        POP3    ✅      'pop.centurylink.net':995  SSL/TLS
        SMTP    ✅      'smtp.centurylink.net':587  StartTLS
centurytel.net
        CenturyTel.net
        POP3    ✅      'pop.centurytel.net':995  SSL/TLS
        SMTP    ✅      'smtpauth.centurytel.net':587  StartTLS
cgl.ucsf.edu
        UCSF CGL email
        IMAP    ✅      'plato.cgl.ucsf.edu':993  SSL/TLS
        SMTP    ❌ ([Errno 113] No route to host)       'plato.cgl.ucsf.edu':587  StartTLS
charter.net
        Charter Communications
        IMAP    ✅      'mobile.charter.net':993  SSL/TLS
        POP3    ✅      'mobile.charter.net':995  SSL/TLS
        SMTP    ✅      'mobile.charter.net':587  SSL/TLS
clio.ne.jp
        CLIO-Net移管サービス
        POP3    ✅      'mail.clio.ne.jp':110  None
        SMTP    ✅      'mail.clio.ne.jp':587  None
clustermail.de
        Clustermail
        IMAP    ✅      'mail.clustermail.de':993  SSL/TLS
        IMAP    ✅      'mail.clustermail.de':143  StartTLS
        POP3    ✅      'mail.clustermail.de':995  SSL/TLS
        POP3    ✅      'mail.clustermail.de':110  StartTLS
        SMTP    ✅      'mail.clustermail.de':587  StartTLS
        SMTP    ❌ (timed out)  'mail.clustermail.de':25  StartTLS
co1.wind.ne.jp
        群馬インターネット
        POP3    ✅      'co1.wind.ne.jp':110  None
        SMTP    ✅      'co1.wind.ne.jp':587  None
co2.wind.ne.jp
        群馬インターネット
        POP3    ✅      'co2.wind.ne.jp':110  None
        SMTP    ✅      'co2.wind.ne.jp':587  None
co3.wind.ne.jp
        群馬インターネット
        POP3    ✅      'co3.wind.ne.jp':110  None
        SMTP    ✅      'co3.wind.ne.jp':587  None
comcast.net
        Comcast
        IMAP    ✅      'imap.comcast.net':993  SSL/TLS
        IMAP    ✅      'imap.comcast.net':143  StartTLS
        POP3    ✅      'mail.comcast.net':995  SSL/TLS
        POP3    ✅      'mail.comcast.net':110  StartTLS
        SMTP    ✅      'smtp.comcast.net':465  SSL/TLS
        SMTP    ✅      'smtp.comcast.net':587  StartTLS
cty-net.ne.jp
        CTY Mail
        POP3    ✅      'pops.cty-net.ne.jp':995  SSL/TLS
        SMTP    ✅      'smtps.cty-net.ne.jp':465  SSL/TLS
dan.wind.ne.jp
        群馬インターネット
        POP3    ✅      'dan.wind.ne.jp':110  None
        SMTP    ✅      'dan.wind.ne.jp':587  None
dd.iij4u.or.jp
        IIJ4U
        POP3    ✅      'mbox.iij4u.or.jp':110  StartTLS
        SMTP    ✅      'mbox.iij4u.or.jp':587  StartTLS
df.eu
        domainFACTORY
        IMAP    ✅      'sslin.df.eu':993  SSL/TLS
        POP3    ✅      'sslin.df.eu':995  SSL/TLS
        SMTP    ✅      'sslout.df.eu':465  SSL/TLS
dondominio.com
        DonDominio/MrDomain
        IMAP    ✅      'imap.dondominio.com':993  SSL/TLS
        POP3    ✅      'pop3.dondominio.com':995  SSL/TLS
        SMTP    ✅      'smtp.dondominio.com':465  SSL/TLS
earthlink.net
        EarthLink
        IMAP    ✅      'imap.earthlink.net':993  SSL/TLS
        POP3    ✅      'pop.earthlink.net':995  SSL/TLS
        SMTP    ✅      'smtpauth.earthlink.net':587  StartTLS
educa.madrid.org
        Plataforma EducaMadrid
        IMAP    ❌ (timed out)  'imap.educa.madrid.org':993  SSL/TLS
        POP3    ❌ (timed out)  'pop.educa.madrid.org':995  SSL/TLS
        SMTP    ❌ (timed out)  'smtp01.educa.madrid.org':465  SSL/TLS
        SMTP    ❌ (timed out)  'smtp01.educa.madrid.org':587  StartTLS
elpasotel.net
        Elpasotel.net
        IMAP    ❌ ([SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: Hostname mismatch, certificate is not valid for 'mail.elpasotel.net'. (_ssl.c:1000))    'mail.elpasotel.net':993  SSL/TLS
        POP3    ❌ ([SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: Hostname mismatch, certificate is not valid for 'pop3.elpasotel.net'. (_ssl.c:1000))    'pop3.elpasotel.net':995  SSL/TLS
        SMTP    ❌ ([SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: Hostname mismatch, certificate is not valid for 'smtp.elpasotel.net'. (_ssl.c:1000))    'smtp.elpasotel.net':587  StartTLS
email.it
        email.it
        IMAP    ✅      'in.email.it':993  SSL/TLS
        POP3    ✅      'pop.email.it':995  SSL/TLS
        SMTP    ✅      'out.email.it':465  SSL/TLS
emailsrvr.com
        Rackspace Email Hosting
        IMAP    ✅      'secure.emailsrvr.com':993  SSL/TLS
        SMTP    ✅      'secure.emailsrvr.com':465  SSL/TLS
fastwebnet.it
        fastwebnet.it
        IMAP    ✅      'imap.fastwebnet.it':143  StartTLS
        SMTP    ✅      'smtp.fastwebnet.it':587  StartTLS
francetelecom.fr
        Orange
        IMAP    ✅      'imap.orange.fr':993  SSL/TLS
        POP3    ✅      'pop.orange.fr':995  SSL/TLS
        SMTP    ✅      'smtp.orange.fr':465  SSL/TLS
free.fr
        Freebox
        IMAP    ✅      'imap.free.fr':993  SSL/TLS
        POP3    ✅      'pop.free.fr':995  SSL/TLS
        SMTP    ✅      'smtp.free.fr':465  SSL/TLS
freenet.de
        Freenet Mail
        IMAP    ✅      'mx.freenet.de':993  SSL/TLS
        POP3    ✅      'mx.freenet.de':995  SSL/TLS
        SMTP    ✅      'mx.freenet.de':587  StartTLS
gandi.net
        Gandi Mail
        IMAP    ✅      'mail.gandi.net':993  SSL/TLS
        IMAP    ✅      'mail.gandi.net':143  StartTLS
        POP3    ✅      'mail.gandi.net':995  SSL/TLS
        POP3    ✅      'mail.gandi.net':110  StartTLS
        SMTP    ✅      'mail.gandi.net':465  SSL/TLS
        SMTP    ✅      'mail.gandi.net':587  StartTLS
gigahost.dk
        Gigahost Mail
        IMAP    ✅      'mail.gigahost.dk':993  SSL/TLS
        POP3    ✅      'mail.gigahost.dk':995  SSL/TLS
        SMTP    ✅      'smtp.gigahost.dk':587  StartTLS
gmx.com
        GMX Freemail
        IMAP    ✅      'imap.gmx.com':993  SSL/TLS
        IMAP    ✅      'imap.gmx.com':143  StartTLS
        POP3    ✅      'pop.gmx.com':995  SSL/TLS
        POP3    ✅      'pop.gmx.com':110  StartTLS
        SMTP    ✅      'mail.gmx.com':465  SSL/TLS
        SMTP    ✅      'mail.gmx.com':587  StartTLS
gmx.net
        GMX Freemail
        IMAP    ✅      'imap.gmx.net':993  SSL/TLS
        IMAP    ✅      'imap.gmx.net':143  StartTLS
        POP3    ✅      'pop.gmx.net':995  SSL/TLS
        POP3    ✅      'pop.gmx.net':110  StartTLS
        SMTP    ✅      'mail.gmx.net':465  SSL/TLS
        SMTP    ✅      'mail.gmx.net':587  StartTLS
go.tvm.ne.jp
        テレビ松本ケーブルインターネットサービス
        POP3    ✅      'go.tvm.ne.jp':110  None
        SMTP    ❌ (timed out)  'go.tvm.ne.jp':25  None
goneo.de
        goneo
        IMAP    ✅      'imap.goneo.de':993  SSL/TLS
        POP3    ✅      'pop.goneo.de':995  SSL/TLS
        POP3    ❌ ([Errno 101] Network is unreachable) 'pop.goneo.de':110  StartTLS
        SMTP    ✅      'smtp.goneo.de':465  SSL/TLS
        SMTP    ✅      'smtp.goneo.de':587  StartTLS
goo.jp
        goo メールアドバンス
        POP3    ❌ (timed out)  'pop.mail.goo.ne.jp':110  None
        SMTP    ❌ (timed out)  'smtp.mail.goo.ne.jp':587  None
googlemail.com
        Google Mail
        IMAP    ✅      'imap.gmail.com':993  SSL/TLS
        POP3    ✅      'pop.gmail.com':995  SSL/TLS
        SMTP    ✅      'smtp.gmail.com':465  SSL/TLS
gransy.com
        G-Hosting.cz a Station.cz
        IMAP    ❌ ([SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: Hostname mismatch, certificate is not valid for 'imap.gransy.com'. (_ssl.c:1000))       'imap.gransy.com':993  SSL/TLS
        IMAP    ❌ (socket error: [Errno 9] Bad file descriptor)        'imap.gransy.com':143  StartTLS
        POP3    ❌ ([SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: Hostname mismatch, certificate is not valid for 'imap.gransy.com'. (_ssl.c:1000))       'imap.gransy.com':995  SSL/TLS
        POP3    ❌ ([SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: Hostname mismatch, certificate is not valid for 'imap.gransy.com'. (_ssl.c:1000))       'imap.gransy.com':110  StartTLS
        SMTP    ❌ ([SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: Hostname mismatch, certificate is not valid for 'smtp.gransy.com'. (_ssl.c:1000))       'smtp.gransy.com':465  SSL/TLS
        SMTP    ❌ ([SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: Hostname mismatch, certificate is not valid for 'smtp.gransy.com'. (_ssl.c:1000))       'smtp.gransy.com':587  StartTLS
        SMTP    ❌ ([Errno 101] Network is unreachable) 'smtp.gransy.com':25  StartTLS
hal.ne.jp
        ハルインターネット
        POP3    ✅      'mail.hal.ne.jp':110  None
        SMTP    ✅      'mail.hal.ne.jp':587  None
hana.or.jp
        きたうら花ねっと
        POP3    ✅      'mail.hana.or.jp':110  None
        SMTP    ✅      'mail.hana.or.jp':587  None
hetzner.de
        Hetzner
        IMAP    ✅      'mail.your-server.de':993  SSL/TLS
        SMTP    ✅      'mail.your-server.de':465  SSL/TLS
hotmail.com
        Outlook.com (Microsoft)
        IMAP    ✅      'outlook.office365.com':993  SSL/TLS
        POP3    ✅      'outlook.office365.com':995  SSL/TLS
        SMTP    ✅      'smtp.office365.com':587  StartTLS
i.softbank.jp
        SoftBank
        IMAP    ✅      'imap.softbank.jp':993  SSL/TLS
        SMTP    ✅      'smtp.softbank.jp':465  SSL/TLS
ic-net.or.jp
        IC-NET
        POP3    ✅      'mail.ic-net.or.jp':110  None
        SMTP    ✅      'smtp.ic-net.or.jp':587  None
iijmio-mail.jp
        IIJmio セーフティメール
        POP3    ✅      'mbox.iijmio-mail.jp':110  StartTLS
        SMTP    ✅      'mbox.iijmio-mail.jp':587  StartTLS
iiyama-catv.ne.jp
        ケーブルテレビiネット飯山
        IMAP    ❌ ([SSL: DH_KEY_TOO_SMALL] dh key too small (_ssl.c:1000))     'imap.iiyama-catv.ne.jp':993  SSL/TLS
        POP3    ❌ ([SSL: DH_KEY_TOO_SMALL] dh key too small (_ssl.c:1000))     'mail.iiyama-catv.ne.jp':995  SSL/TLS
        SMTP    ✅      'smtpa.iiyama-catv.ne.jp':465  SSL/TLS
inbox.lv
        inbox.lv
        IMAP    ✅      'mail.inbox.lv':993  SSL/TLS
        POP3    ✅      'mail.inbox.lv':995  SSL/TLS
        SMTP    ✅      'mail.inbox.lv':465  SSL/TLS
inet-shibata.or.jp
        インターネット新発田
        POP3    ✅      'po.inet-shibata.or.jp':110  None
        SMTP    ❌ (timed out)  'po.inet-shibata.or.jp':25  None
ipax.at
        IPAX Internet Services
        IMAP    ✅      'mail.ipax.at':993  SSL/TLS
        SMTP    ✅      'mail.ipax.at':465  SSL/TLS
iwafune.ne.jp
        インターネットいわふね
        POP3    ✅      'po.iwafune.ne.jp':110  None
        SMTP    ❌ (timed out)  'po.iwafune.ne.jp':25  None
janis.or.jp
        Janis
        IMAP    ❌ ([SSL: DH_KEY_TOO_SMALL] dh key too small (_ssl.c:1000))     'imaps.janis.or.jp':993  SSL/TLS
        POP3    ❌ ([SSL: DH_KEY_TOO_SMALL] dh key too small (_ssl.c:1000))     'pops.janis.or.jp':995  SSL/TLS
        SMTP    ✅      'smtps.janis.or.jp':465  SSL/TLS
jet.ne.jp
        JETINTERNET
        IMAP    ✅      'imap.jet.ne.jp':993  SSL/TLS
        POP3    ✅      'pop.jet.ne.jp':995  SSL/TLS
        SMTP    ✅      'smtp.jet.ne.jp':465  SSL/TLS
        SMTP    ✅      'smtp.jet.ne.jp':587  StartTLS
ji.jet.ne.jp
        JETINTERNET
        POP3    ❌ ([Errno 113] No route to host)       'pop02.jet.ne.jp':110  None
        SMTP    ✅      'smtp02.jet.ne.jp':587  None
kelcom.net
        KELCOM Internet
        IMAP    ✅      'pop.kelcom.net':993  SSL/TLS
        POP3    ✅      'pop.kelcom.net':995  SSL/TLS
        SMTP    ✅      'smtp.kelcom.net':587  StartTLS
kl.wind.ne.jp
        群馬インターネット
        POP3    ✅      'kl.wind.ne.jp':110  None
        SMTP    ✅      'kl.wind.ne.jp':587  None
kokuyou.ne.jp
        長和町黒耀の里ゆいねっと
        POP3    ✅      'mail.kokuyou.ne.jp':110  None
        SMTP    ❌ (timed out)  'smtp.kokuyou.ne.jp':25  None
kpnmail.nl
        KPN E-mail
        IMAP    ✅      'imap.kpnmail.nl':993  SSL/TLS
        IMAP    ✅      'imap.kpnmail.nl':143  StartTLS
        POP3    ✅      'pop.kpnmail.nl':995  SSL/TLS
        POP3    ✅      'pop.kpnmail.nl':110  StartTLS
        SMTP    ✅      'smtp.kpnmail.nl':465  SSL/TLS
        SMTP    ✅      'smtp.kpnmail.nl':587  StartTLS
laposte.net
        LaPoste
        IMAP    ✅      'imap.laposte.net':993  SSL/TLS
        POP3    ✅      'pop.laposte.net':995  SSL/TLS
        SMTP    ✅      'smtp.laposte.net':465  SSL/TLS
libero.it
        Libero Mail
        IMAP    ✅      'imapmail.libero.it':993  SSL/TLS
        POP3    ✅      'popmail.libero.it':995  SSL/TLS
        SMTP    ✅      'smtp.libero.it':465  SSL/TLS
mahoroba.ne.jp
        インターネットまほろば
        POP3    ✅      'mail.mahoroba.ne.jp':110  None
        SMTP    ✅      'mail.mahoroba.ne.jp':587  None
mail.com
        mail.com
        IMAP    ✅      'imap.mail.com':993  SSL/TLS
        IMAP    ✅      'imap.mail.com':143  StartTLS
        POP3    ✅      'pop.mail.com':995  SSL/TLS
        POP3    ✅      'pop.mail.com':110  StartTLS
        SMTP    ✅      'smtp.mail.com':465  SSL/TLS
        SMTP    ✅      'smtp.mail.com':587  StartTLS
mail.dk
        Yousee Mail
        IMAP    ✅      'imap.mail.dk':993  SSL/TLS
        POP3    ✅      'pop3.mail.dk':995  SSL/TLS
        SMTP    ✅      'asmtp.mail.dk':587  StartTLS
mail.ee
        mail.ee
        IMAP    ✅      'mail.ee':993  SSL/TLS
        POP3    ✅      'mail.ee':995  SSL/TLS
        SMTP    ✅      'mail.ee':465  SSL/TLS
mail.iwafune.ne.jp
        インターネットいわふね
        POP3    ✅      'mail.iwafune.ne.jp':110  None
        SMTP    ❌ (timed out)  'mail.iwafune.ne.jp':25  None
mail.jubii.dk
        Jubii Mail
        IMAP    ✅      'imap.jubii.dk':993  SSL/TLS
        POP3    ✅      'imap.jubii.dk':995  SSL/TLS
        SMTP    ✅      'smtp.jubii.dk':465  SSL/TLS
mail.ru
        mail.ru
        IMAP    ✅      'imap.mail.ru':993  SSL/TLS
        IMAP    ✅      'imap.mail.ru':143  StartTLS
        POP3    ✅      'pop.mail.ru':995  SSL/TLS
        POP3    ✅      'pop.mail.ru':110  StartTLS
        SMTP    ✅      'smtp.mail.ru':465  SSL/TLS
        SMTP    ✅      'smtp.mail.ru':587  StartTLS
mail.wind.ne.jp
        群馬インターネット
        POP3    ✅      'mail.wind.ne.jp':110  None
        SMTP    ✅      'mail.wind.ne.jp':587  None
me.com
        Apple iCloud
        IMAP    ✅      'imap.mail.me.com':993  SSL/TLS
        SMTP    ✅      'smtp.mail.me.com':587  StartTLS
messagingengine.com
        FastMail
        IMAP    ✅      'imap.fastmail.com':993  SSL/TLS
        POP3    ✅      'pop.fastmail.com':995  SSL/TLS
        SMTP    ✅      'smtp.fastmail.com':465  SSL/TLS
ml.murakami.ne.jp
        インターネットいわふね
        POP3    ✅      'ml.murakami.ne.jp':110  None
        SMTP    ❌ (timed out)  'ml.murakami.ne.jp':25  None
mnet.ne.jp
        Mnet メール サービス
        IMAP    ❌ ([SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: Hostname mismatch, certificate is not valid for 'mail.mnet.ne.jp'. (_ssl.c:1000))       'mail.mnet.ne.jp':993  SSL/TLS
        IMAP    ❌ (socket error: [Errno 9] Bad file descriptor)        'mail.mnet.ne.jp':143  StartTLS
        POP3    ❌ ([SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: Hostname mismatch, certificate is not valid for 'mail.mnet.ne.jp'. (_ssl.c:1000))       'mail.mnet.ne.jp':995  SSL/TLS
        POP3    ❌ ([SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: Hostname mismatch, certificate is not valid for 'mail.mnet.ne.jp'. (_ssl.c:1000))       'mail.mnet.ne.jp':110  StartTLS
        SMTP    ❌ ([SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: Hostname mismatch, certificate is not valid for 'mail.mnet.ne.jp'. (_ssl.c:1000))       'mail.mnet.ne.jp':587  StartTLS
mopera.net
        mopera U
        IMAP    ✅      'mail.mopera.net':993  SSL/TLS
        IMAP    ✅      'mail.mopera.net':143  StartTLS
        POP3    ✅      'mail.mopera.net':995  SSL/TLS
        POP3    ✅      'mail.mopera.net':110  StartTLS
        SMTP    ✅      'mail.mopera.net':465  SSL/TLS
        SMTP    ✅      'mail.mopera.net':587  StartTLS
mx1.tiki.ne.jp
        TikiTikiインターネット
        POP3    ✅      'mx1.tiki.ne.jp':110  None
        SMTP    ✅      'smtp-auth.tiki.ne.jp':587  None
nifty.com
        @nifty
        POP3    ✅      'pop.nifty.com':110  None
        SMTP    ✅      'smtp.nifty.com':587  None
nsat.jp
        BBにいがた
        POP3    ✅      'mail.nsat.jp':110  None
        SMTP    ✅      'mail.nsat.jp':587  None
ntlworld.com
        NTL World: Virgin Media Mail
        IMAP    ✅      'imap.ntlworld.com':993  SSL/TLS
        POP3    ✅      'pop3.ntlworld.com':995  SSL/TLS
        SMTP    ✅      'smtp.ntlworld.com':465  SSL/TLS
o2.pl
        o2 Poczta
        IMAP    ✅      'poczta.o2.pl':993  SSL/TLS
        POP3    ✅      'poczta.o2.pl':995  SSL/TLS
        SMTP    ✅      'poczta.o2.pl':465  SSL/TLS
        SMTP    ✅      'poczta.o2.pl':587  StartTLS
ocn.ne.jp
        OCN
        POP3    ✅      'pop.ocn.ne.jp':995  SSL/TLS
        SMTP    ✅      'smtp.ocn.ne.jp':465  SSL/TLS
office365.com
        Microsoft 365
        IMAP    ✅      'outlook.office365.com':993  SSL/TLS
        POP3    ✅      'outlook.office365.com':995  SSL/TLS
        SMTP    ✅      'smtp.office365.com':587  StartTLS
one.com
        one.com
        IMAP    ✅      'imap.one.com':993  SSL/TLS
        SMTP    ✅      'send.one.com':465  SSL/TLS
one.cz
        Webhosting Registrator.cz Mail
        IMAP    ✅      'imap.registrator.cz':993  SSL/TLS
        POP3    ✅      'pop3.registrator.cz':995  SSL/TLS
        SMTP    ✅      'smtp.registrator.cz':587  StartTLS
onet.pl
        Onet Poczta
        IMAP    ✅      'imap.poczta.onet.pl':993  SSL/TLS
        POP3    ✅      'pop3.poczta.onet.pl':995  SSL/TLS
        SMTP    ✅      'smtp.poczta.onet.pl':465  SSL/TLS
        SMTP    ✅      'smtp.poczta.onet.pl':587  StartTLS
ovh.net
        OVH
        IMAP    ✅      'ssl0.ovh.net':993  SSL/TLS
        POP3    ✅      'ssl0.ovh.net':995  SSL/TLS
        SMTP    ✅      'ssl0.ovh.net':465  SSL/TLS
oxcloud-eu
        OX Cloud EU
        IMAP    ✅      'imap.eu.appsuite.cloud':993  SSL/TLS
        IMAP    ✅      'imap.eu.appsuite.cloud':143  StartTLS
        POP3    ✅      'pop.eu.appsuite.cloud':995  SSL/TLS
        SMTP    ✅      'smtp.eu.appsuite.cloud':587  StartTLS
oxcloud-us
        OX Cloud US
        IMAP    ✅      'imap.us.appsuite.cloud':993  SSL/TLS
        IMAP    ✅      'imap.us.appsuite.cloud':143  StartTLS
        POP3    ✅      'pop.us.appsuite.cloud':995  SSL/TLS
        SMTP    ✅      'smtp.us.appsuite.cloud':587  StartTLS
parabox.or.jp
        パラボックス
        POP3    ✅      'pop3.parabox.or.jp':110  None
        SMTP    ❌ (timed out)  'smtp.parabox.or.jp':25  None
pdx.edu
        Portland State University Mail
        IMAP    ❌ ([Errno -2] Name or service not known)       'psumail.pdx.edu':993  SSL/TLS
        IMAP    ❌ ([Errno -2] Name or service not known)       'psumail.pdx.edu':587  StartTLS
        SMTP    ❌ (timed out)  'mailhost.pdx.edu':465  SSL/TLS
        SMTP    ✅      'mailhost.pdx.edu':587  StartTLS
peoplepc.com
        PeoplePC
        IMAP    ✅      'imap.peoplepc.com':143  None
        POP3    ✅      'pop.peoplepc.com':110  None
        SMTP    ✅      'smtpauth.peoplepc.com':587  StartTLS
po.wind.ne.jp
        群馬インターネット
        POP3    ✅      'po.wind.ne.jp':110  None
        SMTP    ✅      'po.wind.ne.jp':587  None
pobox.com
        Pobox
        IMAP    ✅      'mail.pobox.com':993  SSL/TLS
        IMAP    ❌ (timed out)  'mail.pobox.com':143  StartTLS
        POP3    ✅      'mail.pobox.com':995  SSL/TLS
        POP3    ❌ (timed out)  'mail.pobox.com':110  StartTLS
        SMTP    ✅      'smtp.pobox.com':465  SSL/TLS
        SMTP    ✅      'smtp.pobox.com':587  StartTLS
pop.shibata.ne.jp
        インターネット新発田
        POP3    ✅      'pop.shibata.ne.jp':110  None
        SMTP    ❌ (timed out)  'pop.shibata.ne.jp':25  None
posteo.de
        Posteo
        IMAP    ✅      'posteo.de':993  SSL/TLS
        IMAP    ✅      'posteo.de':143  StartTLS
        POP3    ✅      'posteo.de':995  SSL/TLS
        POP3    ✅      'posteo.de':110  StartTLS
        SMTP    ✅      'posteo.de':465  SSL/TLS
        SMTP    ✅      'posteo.de':587  StartTLS
ptd.net
        PenTeleData
        IMAP    ✅      'promail.ptd.net':993  SSL/TLS
        IMAP    ✅      'promail.ptd.net':143  StartTLS
        POP3    ✅      'promail.ptd.net':995  SSL/TLS
        POP3    ✅      'promail.ptd.net':110  StartTLS
        SMTP    ✅      'promail.ptd.net':465  SSL/TLS
        SMTP    ✅      'promail.ptd.net':587  StartTLS
q.com
        Q.com
        IMAP    ✅      'mail.q.com':993  SSL/TLS
        POP3    ✅      'mail.q.com':995  SSL/TLS
        SMTP    ✅      'smtp.q.com':587  StartTLS
qq.com
        qq.com
        IMAP    ✅      'imap.qq.com':993  SSL/TLS
        SMTP    ✅      'smtp.qq.com':465  SSL/TLS
rambler.ru
        Rambler Mail
        IMAP    ✅      'imap.rambler.ru':993  SSL/TLS
        POP3    ✅      'pop.rambler.ru':995  SSL/TLS
        SMTP    ✅      'smtp.rambler.ru':465  SSL/TLS
rr.com
        RoadRunner/TWC
        IMAP    ✅      'mail.twc.com':993  SSL/TLS
        POP3    ✅      'mail.twc.com':995  SSL/TLS
        SMTP    ✅      'mail.twc.com':587  StartTLS
runestone.net
        Runestone Telecom Association
        POP3    ✅      'mail.runestone.net':995  SSL/TLS
        SMTP    ✅      'mail.runestone.net':587  StartTLS
sapo.pt
        SAPO Mail
        IMAP    ✅      'imap.sapo.pt':993  SSL/TLS
        POP3    ✅      'pop.sapo.pt':995  SSL/TLS
        SMTP    ✅      'smtp.sapo.pt':465  SSL/TLS
schwaz.net
        schwaz.net | Stadtwerke Schwaz
        IMAP    ✅      'imap.schwaz.net':993  SSL/TLS
        POP3    ✅      'pop3.schwaz.net':995  SSL/TLS
        SMTP    ✅      'mail.schwaz.net':465  SSL/TLS
        SMTP    ✅      'mail.schwaz.net':587  StartTLS
seznam.cz
        Seznam
        IMAP    ✅      'imap.seznam.cz':993  SSL/TLS
        POP3    ✅      'pop3.seznam.cz':995  SSL/TLS
        SMTP    ✅      'smtp.seznam.cz':465  SSL/TLS
sfr.fr
        SFR / Neuf
        IMAP    ✅      'imap.sfr.fr':993  SSL/TLS
        POP3    ✅      'pop.sfr.fr':995  SSL/TLS
        SMTP    ✅      'smtp.sfr.fr':465  SSL/TLS
sky.com
        Sky Mail
        IMAP    ✅      'imap.tools.sky.com':993  SSL/TLS
        POP3    ✅      'pop.tools.sky.com':995  SSL/TLS
        SMTP    ✅      'smtp.tools.sky.com':465  SSL/TLS
skynet.be
        Proximus
        IMAP    ❌ (The read operation timed out)       'imap.proximus.be':993  SSL/TLS
        POP3    ✅      'pop.proximus.be':995  SSL/TLS
        SMTP    ✅      'relay.proximus.be':587  StartTLS
so.wind.ne.jp
        群馬インターネット
        IMAP    ✅      'so.wind.ne.jp':143  None
        SMTP    ✅      'so.wind.ne.jp':587  None
strato.de
        Strato
        IMAP    ✅      'imap.strato.de':993  SSL/TLS
        POP3    ✅      'pop3.strato.de':995  SSL/TLS
        SMTP    ✅      'smtp.strato.de':465  SSL/TLS
        SMTP    ✅      'smtp.strato.de':587  StartTLS
studenti.univr.it
        Università degli Studi di Verona
        IMAP    ❌ ([Errno -2] Name or service not known)       'univr.mail.cineca.it':993  SSL/TLS
        POP3    ❌ ([Errno -2] Name or service not known)       'univr.mail.cineca.it':995  SSL/TLS
        SMTP    ❌ ([Errno -2] Name or service not known)       'univr.smtpauth.cineca.it':465  SSL/TLS
t-online.de
        t-online
        IMAP    ✅      'secureimap.t-online.de':993  SSL/TLS
        POP3    ✅      'securepop.t-online.de':995  SSL/TLS
        SMTP    ✅      'securesmtp.t-online.de':465  SSL/TLS
        SMTP    ✅      'securesmtp.t-online.de':587  StartTLS
teol.net
        TEOL.net Mail
        IMAP    ✅      'imap.teol.net':993  SSL/TLS
        POP3    ✅      'pop3.teol.net':995  SSL/TLS
        SMTP    ✅      'smtp.teol.net':465  SSL/TLS
thinline.cz
        Český hosting
        IMAP    ✅      'mail.cesky-hosting.cz':993  SSL/TLS
        IMAP    ✅      'mail.cesky-hosting.cz':143  StartTLS
        POP3    ✅      'mail.cesky-hosting.cz':995  SSL/TLS
        POP3    ✅      'mail.cesky-hosting.cz':110  StartTLS
        SMTP    ✅      'smtp.cesky-hosting.cz':465  SSL/TLS
        SMTP    ✅      'smtp.cesky-hosting.cz':587  StartTLS
        SMTP    ❌ ([Errno 101] Network is unreachable) 'smtp.cesky-hosting.cz':25  StartTLS
tiki.ne.jp
        TikiTikiインターネット
        POP3    ✅      'mx.tiki.ne.jp':110  None
        SMTP    ✅      'smtp-auth.tiki.ne.jp':587  None
tiscali.cz
        Tiscali
        POP3    ✅      'pop3.mail.tiscali.cz':110  None
        SMTP    ❌ (timed out)  'smtp.mail.tiscali.cz':25  None
tiscali.it
        Tiscali Italy
        IMAP    ✅      'imap.tiscali.it':993  SSL/TLS
        POP3    ✅      'pop.tiscali.it':995  SSL/TLS
        SMTP    ❌ ([SSL: DH_KEY_TOO_SMALL] dh key too small (_ssl.c:1000))     'smtp.tiscali.it':465  SSL/TLS
umich.edu
        University of Michigan
        IMAP    ✅      'imap.gmail.com':993  SSL/TLS
        SMTP    ✅      'smtp.gmail.com':465  SSL/TLS
uol.com.br
        UOL
        IMAP    ✅      'imap.uol.com.br':993  SSL/TLS
        POP3    ✅      'pop3.uol.com.br':995  SSL/TLS
        SMTP    ✅      'smtps.uol.com.br':587  StartTLS
verizon.net
        Verizon Online
        POP3    ✅      'pop.verizon.net':995  SSL/TLS
        SMTP    ✅      'smtp.verizon.net':465  SSL/TLS
virgin.net
        Virgin.net: Virgin Media Mail
        IMAP    ✅      'imap4.virgin.net':993  SSL/TLS
        POP3    ✅      'pop.virgin.net':995  SSL/TLS
        SMTP    ✅      'smtp.virgin.net':465  SSL/TLS
virginmedia.com
        Virgin Media Mail
        IMAP    ✅      'imap.virginmedia.com':993  SSL/TLS
        POP3    ✅      'pop3.virginmedia.com':995  SSL/TLS
        SMTP    ✅      'smtp.virginmedia.com':465  SSL/TLS
vivaldi.net
        Vivaldi.net Mail
        IMAP    ✅      'imap.vivaldi.net':993  SSL/TLS
        IMAP    ✅      'imap.vivaldi.net':143  StartTLS
        POP3    ✅      'pop3.vivaldi.net':995  SSL/TLS
        POP3    ✅      'pop3.vivaldi.net':110  StartTLS
        SMTP    ✅      'smtp.vivaldi.net':465  SSL/TLS
        SMTP    ✅      'smtp.vivaldi.net':587  StartTLS
vm.aikis.or.jp
        aikis
        POP3    ✅      'mail.aikis.or.jp':995  SSL/TLS
        SMTP    ✅      'mail.aikis.or.jp':587  StartTLS
vodafonemail.de
        Vodafone
        IMAP    ✅      'imap.vodafonemail.de':993  SSL/TLS
        POP3    ✅      'pop3.vodafonemail.de':995  SSL/TLS
        SMTP    ✅      'smtp.vodafonemail.de':465  SSL/TLS
vp.tiki.ne.jp
        TikiTikiインターネット
        POP3    ✅      'vp.tiki.ne.jp':110  None
        SMTP    ✅      'vs.tiki.ne.jp':587  None
web.de
        WEB.DE Freemail
        IMAP    ✅      'imap.web.de':993  SSL/TLS
        IMAP    ✅      'imap.web.de':143  StartTLS
        POP3    ✅      'pop3.web.de':995  SSL/TLS
        POP3    ✅      'pop3.web.de':110  StartTLS
        SMTP    ✅      'smtp.web.de':465  SSL/TLS
        SMTP    ✅      'smtp.web.de':587  StartTLS
webhuset.no
        Webhuset
        IMAP    ❌ (timed out)  'imap.webhuset.no':993  SSL/TLS
        POP3    ❌ (timed out)  'mail.webhuset.no':995  SSL/TLS
        SMTP    ❌ (timed out)  'smtp.webhuset.no':465  SSL/TLS
        SMTP    ❌ (timed out)  'smtp.webhuset.no':587  StartTLS
websupport.sk
        WebSupport
        IMAP    ✅      'imap.websupport.sk':993  SSL/TLS
        IMAP    ✅      'imap.websupport.sk':143  StartTLS
        POP3    ✅      'pop.websupport.sk':995  SSL/TLS
        POP3    ✅      'pop.websupport.sk':110  StartTLS
        SMTP    ✅      'smtp.websupport.sk':465  SSL/TLS
        SMTP    ❌ (timed out)  'smtp.websupport.sk':25  StartTLS
wildwestdomains.com
        Your WildWest domain
        IMAP    ✅      'imap.secureserver.net':993  SSL/TLS
        POP3    ✅      'pop.secureserver.net':995  SSL/TLS
        SMTP    ✅      'smtpout.secureserver.net':465  SSL/TLS
wp.pl
        Poczta Wirtualna Polska
        IMAP    ✅      'imap.wp.pl':993  SSL/TLS
        POP3    ✅      'pop3.wp.pl':995  SSL/TLS
        SMTP    ✅      'smtp.wp.pl':465  SSL/TLS
xp.wind.jp
        群馬インターネット
        POP3    ✅      'xp.wind.jp':110  None
        SMTP    ✅      'xp.wind.jp':587  None
xtra.co.nz
        Yahoo! Mail
        POP3    ✅      'pop3.xtra.co.nz':995  SSL/TLS
        SMTP    ✅      'send.xtra.co.nz':465  SSL/TLS
yahoo.co.jp
        Yahoo! メール
        POP3    ✅      'pop.mail.yahoo.co.jp':995  SSL/TLS
        SMTP    ✅      'smtp.mail.yahoo.co.jp':465  SSL/TLS
yahoo.com
        Yahoo! Mail
        IMAP    ✅      'imap.mail.yahoo.com':993  SSL/TLS
        IMAP    ✅      'export.imap.mail.yahoo.com':993  SSL/TLS
        POP3    ✅      'pop.mail.yahoo.com':995  SSL/TLS
        SMTP    ✅      'smtp.mail.yahoo.com':465  SSL/TLS
yandex.ru
        Yandex Mail
        IMAP    ✅      'imap.yandex.com':993  SSL/TLS
        POP3    ✅      'pop.yandex.com':995  SSL/TLS
        SMTP    ✅      'smtp.yandex.com':465  SSL/TLS
ybb.ne.jp
        Yahoo! BB
        POP3    ✅      'ybbpop.mail.yahoo.co.jp':995  SSL/TLS
        SMTP    ✅      'ybbsmtp.mail.yahoo.co.jp':465  SSL/TLS
yeah.net
        yeah.net
        IMAP    ✅      'imap.yeah.net':993  SSL/TLS
        SMTP    ✅      'smtp.yeah.net':465  SSL/TLS
zeelandnet.nl
        ZeelandNet e-mail
        IMAP    ✅      'mail.zeelandnet.nl':993  SSL/TLS
        POP3    ✅      'mail.zeelandnet.nl':995  SSL/TLS
        SMTP    ✅      'mail.zeelandnet.nl':465  SSL/TLS
ziggo.nl
        Ziggo Mail
        IMAP    ✅      'imap.ziggo.nl':993  SSL/TLS
        POP3    ✅      'pop.ziggo.nl':995  SSL/TLS
        SMTP    ✅      'smtp.ziggo.nl':587  StartTLS
zoho.com
        Zoho Mail
        IMAP    ✅      'imap.zoho.com':993  SSL/TLS
        POP3    ✅      'pop.zoho.com':995  SSL/TLS
        SMTP    ✅      'smtp.zoho.com':465  SSL/TLS
        SMTP    ✅      'smtp.zoho.com':587  StartTLS

Some of the errors above are due to server blocking.

If anyone wants to reproduce these results, the script is available here. I would request that one only uses this script with free and open source ISPDBs. For the best results, I would recommend running it from a residential network and with a recent version of Python. Feedback is welcome.

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