3 ms·

> or have a way to specify port in DNS records for example https://www.fastmail.help/hc/en-us/articles/360060591153-Manual-DNS-configuration https://www.fastma

• hardwaresofton 4y ago
  TIL about those DNS configurations. It does look like they are actually for clients (i.e. MUAs doing IMAP & Submission), not for relay (i.e. MTAs doing SMTP/SMTPS). I've used MTA-STS and XML to enable auto-config for my stuff: https://vadosware.io/post/thunderbird-autoconfig-for-your-self-hosted-mailserver https://vadosware.io/post/thunderbird-autoconfig-for-your-se... Oh and it looks like MTA-STS might be the solution: https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol#SMTP_MTA_Strict_Transport_Security https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol#... Turns out there's an excellent guide by the UK government: https://www.ncsc.gov.uk/collection/email-security-and-anti-spoofing/using-mta-sts-to-protect-the-privacy-of-your-emails https://www.ncsc.gov.uk/collection/email-security-and-anti-s... https://www.security.gov.uk/guidance/email-guidance/mta-sts/set-up https://www.security.gov.uk/guidance/email-guidance/mta-sts/... Relevant RFC: https://datatracker.ietf.org/doc/html/rfc8461 https://datatracker.ietf.org/doc/html/rfc8461