I'm running an old cvs version so I hope this hasn't been fixed already:
Incredimail has a bug? with its handling of POP3, which dbmail barfs at.

It effectively goes

 RETR 1
 DELE 1
 RETR 2
 DELE 2
 RETR 3
 DELE 3
 RETR 4
 DELE 4

 DELE 1
 - ERR No such message
 DELE 2
 - ERR No such message
 DELE 3
 - ERR too many failures go away

Incredimail does a double-delete which dbmail doesn't like. I did a quick
fix to handle this (updated MAX_ERRORS to 50) but this is obviously an issue
for us. We're notifying incredimail, but the current version is already out
there.

This can probably be handled a few ways:
1) allow double deletion without an err
2) don't disconnect with err if already logged in (eg. Not in user/pass
query state)
3) don't increment error count for this particular error message

/Mark 

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