December 2002
Intermediate to advanced
1232 pages
56h 38m
English
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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.[1] Instead, it calls other
programs (called mail delivery agents) to perform that service.
Because the mechanics of delivery can vary so widely from delivery
agent to delivery agent, sendmail needs a great
deal of information about each delivery agent. Each
sendmail M configuration
command defines a mail delivery agent and the information that
sendmail needs.
[1] For the purpose of this discussion, we gloss over the fact that sendmail actually can deliver directly to files (Section 12.2.2).
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