DialDelay option (DialDelay),
if set, allows sendmail to try to connect a
second time if the first connection attempt times out or fails. This
option is intended primarily for dial-up connections, but it can also
be useful if your fast connection is very busy.
Prior to V8.12, setting the DialDelay option
caused it to be used by all delivery agents, even those for which it
made little sense. Beginning with V8.12, the
DialDelay option only affects delivery agents that
have this F=Z delivery agent flag set.
You can add this to a delivery agent with the MODIFY_MAILER_FLAGS
mc configuration macro:
MODIFY_MAILER_FLAGS(`SMTP', `+Z') this must be
MAILER(`smtp') before this
Here, we add the F=Z delivery agent flag to the
smtp delivery agent. As with all modifications of
delivery agent flags, the modification must precede the MAILER
declaration of the delivery agent.