Re: [Exim] blocking blank from addresses

On Tue, 30 Apr 2002, Matthew Byng-Maddick wrote:

> In the face of mail system abuse,
> it is clear that this is a very grey area. Remember that the tester is not
> able to test DSNs.

Well, if the tester sends valid HELO, and then says MAIL FROM:<> and
the other end immediately says "bogus from" with a 5xx, then they
failed the test, no?

callbacks are fun when that happens. Some ignorant senders even
respond to the resulting rejection by passing the spam onto our
secondary MX to see if that can do a better job, but callback soon
deals with that too.

(Just to clarify: this is exim v3, and callbacks are only enabled for
a shortlist of domains.)