EX_TEMPFAIL
A recoverable error sendmail exit value
The EX_TEMPFAIL
exit code (value 75) is returned by
sendmail to indicate that a
temporary error has occurred. Temporary errors mean
that the mail message will be put in (or remain in)
the queue for the present and another delivery
attempt will be made later.
One example of this type of error occurs when looking up aliases via a network service, such as NIS. If all the servers are too busy to answer before a timeout, sendmail should temporarily queue the message and look up the aliases again later.
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