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Obviously it would be better if there was no downtime, but the sending MTA should really have queued that mail and delivered it when Fastmail was back up.

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It was down long enough that it blew through the queue for several (most? some?) MTAs which were about ~36 hours if I remember correctly.

The default I have seen everywhere (qmail, postfix) is a week.

that's assuming no one changes defaults... if your a large enough provider you are tweaking these settings.

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