Email delivery is supposed to attempt more than 1 time.
If the first message gets deferred then the MTA (mail server) is going to retry the message X number of times in X given period. Usually you've seen a proper mail server set up with a reply to your email that the message has been in queue too long, or that the mail server has given up after 3 days.
Which mail servers are behaving badly, and are only trying 1 attempt?
The GUILTY:
to name a few...
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