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 '[email protected]'?

It's not a Mimedefang error.

Joseph Brennan
Columbia University Information Technology



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