Messages in Mqueue not being delivered

[Richard Peiper]

        I am not sure this is a MailScanner issue, but someone here probably
knows more about sendmail than I do and can help with this.

        We are running MailScanner 4.50 with the patch, and Spamassassin on
a RedHat Linux 8.0 machine. Twice in the past 2 days the mail has stopped
being delivered. It comes in, and is scanned, moves from mqueue.in to mqueue
then just sits there.

        If I reboot the machine, everything starts being delivered again
EXCEPT for the ones which were sitting in mqueue previously. This has
happened twice now and I have 5000 messages sitting in mqueue.

        Anything new which comes in is immediately scanned and delivered.
Running sendmail -q processes the new messages but not the old ones. And
running sendmail -qI<id> -v just comes back to the prompt with nothing else
printed.

        Any ideas? Are these old messages now marked as undeliverable and
will never be delieverd again? Help please?

        Thanks
        Richard Peiper