I'm running vpopmail in a clustered environment with several mail
servers and a dedicated database server.  vpopmail has been configured
for MySQL clustering and each of the mail servers check locally for
reads and only write to the database server.  On one of the boxes it's
failing smtp authentication reporting "vpopmail user not found" in the
logs, and yet the user does exist.  MySQL max_connections has been set
to 500 and we're using about 60-100 on an average day.  Does anyone have
any ideas on why vpopmail would be reporting the user doesn't exist when
they do?  And why it's only happening on one machine?  I would really
appreciate any ideas on, if nothing else, other places to look.


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