manu 5ae0f4961a Make sure temporary errors are reported as such, using status code
EX_TEMPFAIL (cannot lookup user through NSS, may be because of an
unreachable NIS or LDAP server), or EX_OSERR (other file or memory
related problems).

Sendmail and Postfix should honour EX_TEMPFAIL and EX_OSERR by
queueing the message.

This avoids problems with transcient NSS errors, where the MTA may
successfully lookup a user at a time while mail.local can fail a
few secoonds later.
2008-05-04 03:03:11 +00:00
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