It can be warning-timeout if the message has reached
its Timeout.queuewarn option threshold (?§24.9.119 on page 1097). It can be postmasterwarning
if the failure was delivered to the postmaster as a result of a problem that the postmaster
should fix, such as an MX configuration error. It can be return-receipt if the
message was returned because of a Return-Receipt-To: header (?§25.12.34 on page 1165) or
a DSN NOTIFY=SUCCESS request (RFC1891). Finally, it can be failure for any other
reason.
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1152 | Chapter 25: The H (Headers) Configuration Command
In all instances, sendmail also adds a Subject: header that contains a generic bounce
message.
The Auto-Submitted: header should never be defined in the configuration file.
25.12.4 Bcc:
Blind carbon copy RFC2822
A blind carbon copy is a copy of the mail message that is sent to one or more recipients
without the knowledge of the primary recipients. Primary recipients are listed in the To:
and Cc: lines. When there are multiple blind carbon copy recipients, knowledge of each
other is also hidden.
When run with a -t command-line switch (to gather recipients from the headers), the sendmail
program achieves this end by saving a list of all the blind carbon copy recipients,
deleting the Bcc: header line, and then delivering to each blind carbon copy recipient.
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