Comment on Fastmail to end support for operamail.com email addressesparentComments−dmm5y A 15 second down time means an important mail might not reach youEmail servers will retry sending messages and won't expire them unless the retries fail for several days. So even a day of downtime shouldn't result in losing email.
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Email servers will retry sending messages and won't expire them unless the retries fail for several days. So even a day of downtime shouldn't result in losing email.