I'm not sure if this is appropriate for the qmail list, but here goes... On two occasions now I've had qmail suddenly stop processing outgoing (only) mail. I have not been able to correspond this to any events and there were no changes to the qmail configuration, firewall or internal (behind the firewall) mail server at either failure. At both times, the mail server was running happily with the qmailqueue patch for months. At the first failure, I tried queue-fix, re-creating the /var/qmail/queue dirs, and changing the QMAILQUEUE env variable from pointing to our virus filter to its original destination of qmail-queue. What finally fixed it, however, was re-installing qmail from a virgin qmail tarball without the qmail queue patch. What's also odd is that the error message was different both times. The first, I got: deferral: <IPAddr>_failed_after_I_sent_the_message./Remote_host_said:_451_qq_write_err or_or_disk_full_(#4.3.0)/ The second time: deferral: <IPAddr>_failed_after_I_sent_the_message./Remote_host_said:_451_qq_internal_ bug_(#4.3.0)/ Again, both times the fix was to re-install qmail without the QMAILQUEUE patch. SO, I believe this patch to be mature and widely used. I have no idea why this is going on and why I haven't seen similar complaints in the list archives. It's occurred on both a RH6.2 system and RH7.0 system, both instances were running the most current fixes. The box delivers all its mail internally via smtproutes. Any ideas? Thanks! Rudy Pawul System Administrator