A system that's been running with 9000 users is now experiencing
intermittent false positives when checking for invalid recipients.  It's
allowing invalid recipients "sometimes".  I cannot find a pattern.

Any guess on areas that might be culprits?  Does chkuser have a default
"permit" behavior if it cannot reach IMAP or Sql?  Not sure if there's a
resource issue on the machine yet.

Mysql backend, linux, courier imap, vpopmail 5.4.17, chkuser 2.08b



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