6 and later)
When sendmail attempts to establish a network connection to another host, it uses the
connect(2) system call. If the connection is going to fail, that system call will time out after
an amount of time that varies with the operating system. With some buggy versions of
Linux, for example, the timeout is 90 minutes, whereas for other versions of Unix it is typically
one to five minutes, and for newer versions of Unix it is 75 seconds.
When the amount of time to wait for a connection to fail is of concern, you can override
the system value with the connect keyword to the Timeout option:*
O Timeout.connect=timeout ?†? configuration file (V8.6 and later)
-OTimeout.connect=timeout ?†? command line (V8.6 and later)
define(`confTO_CONNECT??, `timeout??) ?†? mc configuration (V8.6 and later)
If no timeout is specified, the default is to use the system-imposed timeout. No default is
defined for the mc technique.
Note that if the connect(2) call times out, delivery will be deferred until the next queue run.
If you wishth e connect(2) to be tried again (as you might for a dial-on-demand machine),
you should investigate the DialDelay option (?§24.9.37 on page 1007).
24.9.119.5 Timeout.control (V8.10 and later)
Beginning withV8.10, sendmail can now be controlled in a limited fashion via a Unix
domain socket (see ?§24.9.25 on page 990).
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