9.35 on page 1004). If an unknown delivery mode is specified, the following error is
printed and this key is ignored:
554 5.3.5 Unknown delivery mode first character here
24.9.27.5 DaemonPortOptions=Family=
The Family key is used to specify the network family. The legal possible values are inet for
AF_INET, inet6 for AF_INET6, iso for AF_ISO, ns for AF_NS, and x.25 for AF_CCITT:
O DaemonPortOptions=Family=iso
Note that only inet, inet6, and iso are currently supported. The default is inet. Also note
that inet requires NETINET to be defined, inet6 requires NETINET6 to be defined, and
iso requires NETISO to be defined when sendmail is compiled (see ?§3.4.32 on page 126).
Whenever sendmail calls rule sets to process a message, it puts the value of this
DaemonPortOptions=Family option into the ${daemon_family} macro (?§21.9.32 on page 818).
That macro is available for designing rule sets which make decisions based on the address
family.
24.9.27.6 DaemonPortOptions=Listen=
When sendmail begins to run in daemon mode, it executes a listen(2) system call as part of
monitoring its SMTP port for incoming mail. The second argument to listen(2) defines the
maximum length to which the incoming queue of pending connections can grow. If a
connection request arrives with the queue full, the client will receive an error that indicates
ECONNREFUSED.
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