RE: What to do about these barelinefeeds?

[Frank Tegtmeyer]

> but it seems that you'd never want the 451 in this case
> because obviously it will be the same mailer that will
> retry each time and it will continue to be broken for each
> try...

If you don't like this behaviour block him at the firewall or via 
tcpserver. At least for a while.

If you want to see what is going on at the smtp level you could patch 
qmail-smtpd to do some logging. There are some patches at www.qmail.org.
If you are interested, I have one that combines logging with the badrcptto 
patch.

Regards, Frank