We run a service (hosting Discourse, natch) where we send a *lot* of
email to customers' customers.
An important chunk of the traffic is email signup verifications — on
initial signup we verify the new user owns the address. Ideally they're
only waiting for a few seconds and can sign up for a forum right away.
Unless their mail server implements greylisting.
Naturally, this is "our problem to fix" even though delaying mail is a
choice made by the receivers.
We've kept postfix's five minute default, but is there any kind of
common consensus for a lower value being a safe choice?
I'm extremely wary of lowering it as we don't want to risk any
reputation damage from aggressive retries, but we also want to provide a
good experience for the end user.
What do other senders in similar situations do?
--
Michael Brown
Civilized Discourse Construction Kit, Inc.
https://www.discourse.org/
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