Heiko Schlittermann wrote:
Hello,

Dave Restall - System Administrator,,,<[email protected]>  (Thu Mar 24 15:50:22 
2011):
I use exim to receive and process my emails - have done for years.
I also use sender callouts - have done for years.  Occasionally emails
get rejected because they are sent from non-existent addresses and sender
callouts don't like that.

We're using callouts for sender verification, but we do not tell
anybody.

'Stealth' callouts?

Is that like invisible ink?  Does one need a secret encoder ring?

Bill


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