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Description
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 However, this script could still be run periodically to find outdated existing configs, as well as to check proposed new config files.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.