Re: Exim header problem?

> Fully agree with those sentiments, but I don't want to make a change
> that is way-out when compared to what other MTAs do.

qmail replaces a blank envelope sender with MAILER-DAEMON. It also
converts spaces, tabs, and newlines to hyphens. For many MUAs it's
critical that the (corrupted) envelope sender be exactly one word.

---Dan