email_check

Queries MXToolBox and checks DKIM, DMARC, and SPF records for a given domain.
Automatically finds all selectors for a domain, unless specified which selectors to check.

Installation

This repo can be installed by downloading the zip file here or by cloning the repository:

git clone https://github.com/TaranYourAss/email_check.git

Dependencies

This script relies on the curl_cffi library: https://github.com/yifeikong/curl_cffi

You can install all depenencies via:
pip install -r requirements.txt

Usage

Example:
This will run all checks against the Twitch domain with only the "google" DKIM selector being checked for DKIM failures, and then print verbose details.
python3 email_check.py -v -d twitch.tv -s google

If you do not know what selectors a domain uses, you can just input the domain and the script will automatically find all selectors for that domain.
python3 email_check.py -d twitch.tv

[*] Running DMARC, DKIM, and SPF checks for twitch.tv...
[*] Found 7 DKIM selectors for twitch.tv:
 -  google               -  zendesk2
 -  s1                       -  mandrill
 -  s2                       -  k1
 -  zendesk1
[*] DKIM Check: PASS
[*] SPF Check: FAIL
[*] DMARC Check: PASS

Using the -v flag can show you exactly why a check failed:

[*] SPF Check: FAIL
    Record Content: v=spf1 include:_spf.google.com include:amazonses.com include:spf.mtasv.net include:mail.zendesk.com include:_spf.twitch.tv include:aspmx.pardot.com a mx -all
    Failed:
        * SPF Included Lookups - Too many included lookups (12)
             -  https://mxtoolbox.com/Problem/spf/SPF-Included-Lookups?page=prob_spf&showlogin=1&hidetoc=1&action=spf:twitch.tv