When
listening on port 25 for inbound mail, sendmail is functioning as an MTA. When listening
on port 587 for locally submitted mail, sendmail is functioning as an MSA.
Table 24-15. Modify= port option letters
Letter Meaning
a Require authentication with the AUTH ESMTP keyword before continuing with the connection. Do not use this setting
on a public MTA that listens on port 25!
b Only send mail out on the interface address through which mail has been received. This is most useful on a host that
is known by many hostnames, such as an ISP supporting multiple company domains on a single server, although it is
also useful on smaller machines that restrict inbound connections to particular addresses.
c Always perform hostname canonification. Determined via the ${daemon_flags} macro (?§21.9.33 on page 818)
and the ${client_flags} macro (?§21.9.20 on page 812).
f Require fully qualified hostnames. Whether a hostname is fully qualified is determined via configuration file rules
that employ the ${daemon_flags} macro (?§21.9.33 on page 818) and the ${client_flags} macro
(?§21.9.20 on page 812). See also FEATURE(accept_unqualified_senders) (?§17.8.1 on page 614).
h Ignored by the daemon.
r Request fully qualified recipient address. Uses ${daemon_flags} (?§21.9.33 on page 818) and ${client_
flags} (?§21.9.20 on page 812).
s Use SMTP over SSL (V8.
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