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836 | Chapter 21: The D (Define a Macro) Configuration Command
If this optional argument is given to FEATURE(msp), that argument is assigned to the
${MTAHost} macro. If this optional argument is absent, the value assigned to ${MTAHost} is
[localhost]. The square brackets around localhost suppress the lookup of MX records.
All messages will be forwarded to the ${MTAHost}. If you wishto suppress MX lookups for
the ${MTAHost} host, surround the hostname with square brackets when you declare it with
FEATURE(msp):
FEATURE(`msp??, `[otherhost]??)
See ?§2.5 on page 60 for a description of how to install an MSP server, and ?§17.8.32 on page
633 for a description of FEATURE(msp).
You should never use this ${MTAHost} macro directly, because it might change in a future
release of sendmail. Use FEATURE(msp) instead.
21.9.72 $n
The error message sender All versions
The $n macro contains the name of the person who returns failed mail. Traditionally, that
value is the name MAILER-DAEMON.
When delivery fails, notification of that failure is sent to the originating sender. The sendmail
program generates a new message header, where the sender of the error mail message
(and the sender in the envelope) is taken from $n. Then, sendmail includes the original
header and all error information in the body, but might or might not include the original
body in the bounce message (?§6.
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