At Wed, 14 Apr 2004 08:57:47 -0600,
'Jim Ramsay' wrote:
> 
> David Bremner wrote:
> 
> 
> > to be honest, address verification is the biggest
> > factor.
> 
> I'm curious... what do you mean by "address verification"?
> 

Exim will optionally attempt verify the envelope sender by calling the
appropriate SMTP server and doing a partial SMTP transaction.  See

http://www.exim.org/exim-html-4.30/doc/html/spec_38.html#IX2302

There are of course various issues about caching answers, deadlock, 
and so forth that seem to be satisfactorially addressed by the 
current implementation.  Your milage may vary...

db


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