4 ms·
This depends on the sender's mailserver to cache the mail for a day (or a full weekend) without rejecting it. Some mailservers will kickback mail much sooner.
by posguy 6y ago
This depends on the sender's mailserver to cache the mail for a day (or a full weekend) without rejecting it. Some mailservers will kickback mail much sooner.
- upofadown 6y agoSuch servers are then not compliant with the standard of 4-5 days. See RFC 5321 sec 4.5.4.1. Are non-standard retry intervals actually that common?