Set the filter's I/O timeout value.
||smfi_settimeout should only be called before smfi_main.
||Sets the number of seconds libmilter will wait
for an MTA communication (read or write) before timing out.
If smfi_settimeout is not called, a default timeout of 7210 seconds is used.
||The number of seconds to wait before timing out (> 0).
Zero means no wait, not "wait forever".
||smfi_settimeout always returns MI_SUCCESS.
Decreasing the timeout is strongly discouraged
and may break the communication with the MTA.
Do not decrease this value without making sure that
the MTA also uses lower timeouts for communication
(with the milter and with the SMTP client).