-d34.1
Watch header assembly for output Debug command-line switch
When sendmail bounces a mail
message, it needs to create headers that probably
didn’t exist before. It uses the
putheader( ) routine to
create them. The -d34.1
(a.k.a. -d34
) debugging switch causes
sendmail to print the
following on entry to that routine:
--- putheader, mailer = agent ---
Here, agent is the symbolic name of the delivery agent that will deliver the bounced message.
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