On 22/08/2025 04:43, Viktor Dukhovni via mailop wrote:
Therefore, and especially for email, given that SMTP deliveries are queued and retried, I don't see a compelling reason for long TTLs.
I would say that for email it's not so much the delivery itself, it's the plethora of other checks. E.g. receivers checking DKIM/DMARC and having stringent requirements for such (Microsoft DNS failures in this regard have come up on this list a few times).
We occasionally see rejects from Gmail when it thinks there is no PTR record for the IP address that is sending the email, even though the record is there.
The problem with these checks is that there is no retry mechanism - the email is just rejected.
Andy _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
