MailScanner stops delivering e-mail to Postfix

[Douglas Ward]

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After upgrading MailScanner to version 4.45.4-1 (Mandrake 2005) I have
noticed that my mail gateways seem to be stopping delivery at random
times.  After a lot of time searching for a postfix error I am starting
to think that something may be wrong with MailScanner. 
 
Symptoms:
1) Postfix accepts the message and places it in the hold queue. 
MailScanner scans the message but never gives it back to postfix. It
remains in the hold queue forever.
2) I see e-mail in the queue that is several days old.  MailScanner moved
all of the e-mail from that day except for a handful of messages.
3) There are times when postfix will run with a certain number of
messages in the queue.  I'll check it in the morning and see 59 messages
(for example).  E-mail will deliver all day and that evening the same 59
messages are still in the queue.  I can usually identify the problematic
messages after a few days because they are much older than current
e-mail.
 
If I manually move the messages from /var/spool/postfix/hold to
/var/spool/postfix/incoming they are immediately delivered.  Last night
around midnight I dumped 3,000 messages from Friday and Saturday just so
they could be delivered.  I saw a similar thread in the archives and
checked to make sure our DNS lookups are working properly.  Has anyone
seen this before in this new version?  The previous version was rock
solid with no delivery problems to speak of.  If I can't find an answer
soon I will have to revert to the previous version.  I appreciate your
help!

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