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

Joseph Brennan brennan at columbia.edu
Wed Apr 11 15:03:42 EDT 2012

> Now I'm wondering if it is from sendmail itself...

No.  Really, google the whole sentence...

This message has been blocked because the return email domain is invalid.

...and see people on a bewildering variety of systems who report
seeing and want to know what it's about.  I've never seen it myself.

Joseph Brennan
Columbia University Information Technology

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