-d34.1

-d34.1

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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.