> In the other hand we do callouts with a special
> username (not <>) to avoid problems with servers rejecting bounces

No matter your opinion on callouts, that is an epically bad idea. Imagine
that you and I are both doing that, and I want to send you an email:

You get an email from [email protected]
    Your server replies with a callback from [email protected]
My server sees an incoming message from [email protected] to
[email protected] and responds with a callout from [email protected]
    Your server responds with a callout from [email protected] to
[email protected]....

Loopy!
-- 
Dave Pooser
Cat-Herder-in-Chief, Pooserville.com
"...Life is not a journey to the grave with the intention of arriving
safely in one pretty and well-preserved piece, but to slide across the
finish line broadside, thoroughly used up, worn out, leaking oil, and
shouting GERONIMO!!!" -- Bill McKenna



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