alt Hacker NewsWe already had 'low effort' mail queues (for things like password reset emails: these are retried 1/2/4/8 minutes apart and don't generate bounces, other than an API flag and a metrics record), to which we added 'least effort' for DMARC reports. Retry once, then forget about the entire thing other than incrementing a counter for the destination domain.
> retried 1/2/4/8 Minuten apart
That's generally not very clever, as it will impose an unneeded burden on a receiving server which actually has temporary resource problems, and it will collide with greylisting, for example.
RFC 5321 states in section "4.5.4.1. Sending Strategy" that the retry interval should be at least 30 minutes, while the give-up time needs to be at least 4–5 days:
https://datatracker.ietf.org/doc/html/rfc5321#section-4.5.4