This Listen key is used to change the size of the incoming queue from
its default of 10. If Listen is less than or equal to zero, listen(2) will silently set its own
default. But note that some kernels might have built-in defaults of their own, so setting
Listen might have no effect.
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996 | Chapter 24: The O (Options) Configuration Command
24.9.27.7 DaemonPortOptions=Modify=
Beginning withV8.10 sendmail, you can modify selected characteristics of the port. Modification
is done by listing selected letters from Table 24-15 following the Modify=. Note that
the letters are case-sensitive. Also note that of these letters, only h, S, and A are valid for the
ClientPortOptions option.
In general, uppercase letters turn items on, and lowercase letters turn items off. Note that
use of letters other than those shown will not yield an error. In fact, you can add your own
letters and then use a ${daemon_flags} (?§21.9.33 on page 818) or ${client_flags}
(?§21.9.20 on page 812) macro in your own custom rule sets to produce other interesting
port-based decisions. One possibility might be to insist that any sender addresses arriving
in the internal interface be fully qualified, and part of the local domain.
24.9.27.8 DaemonPortOptions=Name=
Because sendmail can listen on different ports simultaneously, and can bind to specific
interfaces, it is desirable that each such instance be given a distinctive name.
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