On Tue, 17 Oct 2006, Rene Marticke wrote:
> let me explain two scene why this callouts are abuse.
>
> 1.
> me@domA send mail to you@domB
> --> domB callout whith postmaster@domB if me@domA is valid.
> --> domA use callout to -> so call domB if postmaster@domB is a valid
> user .... loop
That is precisely why Exim does *not* do a callout with postmaster@domB
to verify a sender. It does the callout with "<>" as the sender. We've
had this discussion several times. There are some options for varying
the callout sender for recipient verifications (when one is generally
talking to another of your own MTAs), but not for sender verifications.
--
Philip Hazel University of Cambridge Computing Service
Get the Exim 4 book: http://www.uit.co.uk/exim-book
