[Mimedefang] Rejecting e-mails with blank CC: and Reply-To:

Joseph Brennan brennan at columbia.edu
Wed Apr 11 12:23:34 EDT 2012

> 554 5.7.1 This message has been blocked because the return email domain
> is invalid.(domain name   has invalid syntax)

Googled web pages suggest that the problem is a bad envelope sender.
In the case above the domain appears to be a blank. Is the sender
just 'user' instead of 'user at domain.tld'?

It's not a Mimedefang error.

Joseph Brennan
Columbia University Information Technology

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