[exim] No Return Path

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Author: Jonathan Gilpin
Date:  
To: exim users
Old-Topics: Re: [exim] Blocking this spam..
Subject: [exim] No Return Path

On an exim server:

Sending:

MAIL FROM: <>
250 OK

Surely I need to prevent this from being allowed? How can I make Exim
reject a message if MAIL FROM: is blank?

Kind Regards,

Jonathan Gipin