Interesting (but not related) - I found a message that was obviously a mix between two different senders, via prefork.
I thought I had traced the auth problem to a script that called a module that couldn't locate DBI (used to access a flat file). However, it was just because the @INC was different if you test (as I did) as root, rather than as smtpd. So, somewhere along the line I switched over to forkserver, which I'm still running. But I still have the same problem with authenticated senders: So far as I can determine, it's simply that qpsmtpd is not running the auth module each time. Sometimes there is an auth and the message is queued. Sometimes there is a connection and no auth. Sometimes there appears to be no connection in the logs. Might there be something in the way the modules are called? Thanks. J. (wondering if I'll have any work after today :-(