did you try the -q and the -m options ???
here's how i'm using smail:
sendmail -bd -q30m
p.s.i think sendmail is a symlink to smail
-q[interval]
Cause smail to process its input spool directory.
If an interval is given, smail will repeatedly
check its input spool directory, sleeping for the
given interval between checks. The interval is in
seconds, though it can be defined as a sequence of
numbers with suffixes of `s' for seconds, `m' for
minutes, `h' for hours, `d' for days, `w' for weeks
and `y' for years. For example, -q2h30m specifies
an interval of two hours and 30 minutes. This flag
is useful in conjunction with the -bd mode of oper-
ation and will cause the daemon process to wake up
on these intervals and perform queue processing.
Performing a single queue run is the default mode
of operation if smail is invoked as runq. Any
parameters are used to match message ids in the
queue, and those messages are processed. If a mes-
sage id is given, but the message is not in the
queue (due to a mistake or the message having been
already delivered), then the parameter is silently
ignored.
-m or -om
Allow retention of the sender as a recipient for
alias and mailing list expansions that include the
sender. If this is Not set, the sender will not
receive a copy of the message only as a result of
being in an alias or mailing list.
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