Wrote a small script to aid in investigating overall security posture of SMTP for domains.
It obtains the following:
MX records, CAA records, SPF records, DMARC records, MTA-STS records, IPv4 and IPv6 MTA-STS records, the corresponding TLSA records (for specified SMTP ports), DNSSEC status, and the well-known MTA-STS TXT file for a given list of domains.





