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Re:Ask HN: Yahoo disregarding RFC 5321 retries by rescbr on Thursday March 17, 2022 @01:24PM (#30713621)
At least some years ago, Gmail used to retry for 2 or 3 days before giving up.
Re:Ask HN: Yahoo disregarding RFC 5321 retries by londons_explore on Thursday March 17, 2022 @10:43PM (#30718236)
It still does in some cases.

For example of you send a message from Gmail to another Gmail user with a full mailbox, it keeps retrying delivery for many days.