Milter-greylist

On Mon, Jul 09, 2007 at 11:43:10AM -0400, Matt Kettler wrote:
> You can end up in the rfc-ignorant RBL for rejecting all messages with null
> return-path's.

It would get worse than that.

Postfix (and other MTAs?) also use an empty return-path when they perform
sender address verification. Blocking all such SMTP delivery attempts
would result in the outgoing e-mail to get blocked.

	Kind regards

-- 
Matthias Scheler                                  http://zhadum.org.uk/