Hi, Reading the Internet and looking at actual public DNS records and email headers, there seem to be disagreements regarding the usage of things like DMARC/DKIM/SPF. Some discussions are sometimes old (like 2014) and have not been rediscussed recently.
So far, I identified the followings: - MUST: have a proper Reverse DNS - MUST: have a proper HELO/EHLO value (matching DNS) - MAY: have SPF configured to announce official MTA - MAY: have DKIM configured to sign outgoing emails - MAY: have DMARC set with p=none // many MTA won't check - DONT: have DMARC set with p=(quarantine|reject) // may break things What would be the recommandations from the OpenSMTPD project as of 2019 when one want to setup an MTA? Are those MUST/MAY/DONT correct? Are there more things to add to this checklist? Thank you. -- You received this mail because you are subscribed to email@example.com To unsubscribe, send a mail to: misc+unsubscr...@opensmtpd.org