September 2004
Intermediate to advanced
192 pages
10h 12m
English
Content preview from sendmail 8.13 CompanionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 20. The M (Mail Delivery Agent) Configuration Command
Other than relaying mail via SMTP or LMTP, the
sendmail program does not perform the actual
delivery of mail.[25] Instead,
it calls other programs (called mail delivery
agents
[26]) to perform that service. Because the mechanics of
delivery can vary widely from delivery agent to delivery agent,
sendmail needs a great deal of information about
each one. The sendmail
M
configuration command defines a mail delivery agent and provides the
information that sendmail needs.
What’s New with V8.13
V8.13 sendmail has made four changes regarding delivery agents, three of which are described here and two of which are described in the specified sections:
The
#erroragent can now return a$@ quarantinewith a reason (Section 11.1.2.6 [V8.13]).Connections caching for the LPC delivery agent (Section 6.1 [V8.13]) is now provided.
The new
F=Bdelivery agent flag strips all leading backslashes (Section 20.1.1 [V8.13])The
F=fflag has been removed from the defaults forlocal_lmtp(Section 20.1.2 [V8.13])The new
F=Wdelivery agent flag causes persistent host status to be ignored for an individual delivery agent (Section 20.1.3 [V8.13])
New F=B Delivery Agent Flag
The F=s (20.8.43[3ed]) delivery
agent flag
causes sendmail to dequote the
recipient’s address before passing it to the
selected delivery agent. Dequoting causes all quotation marks
(“) and all leading backslashes
(\) to be removed. But when a lighter touch is needed, you may use ...
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