On Tue, 17 Oct 2006, Rene Marticke wrote:

> let me explain two scene why this callouts are abuse.
> 
> 1.
> [EMAIL PROTECTED] send mail to [EMAIL PROTECTED]
> --> domB callout whith [EMAIL PROTECTED] if [EMAIL PROTECTED] is valid.
> --> domA use callout to -> so call domB if [EMAIL PROTECTED] is a valid 
> user .... loop

That is precisely why Exim does *not* do a callout with [EMAIL PROTECTED] 
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

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