On Thu, 29 Mar 2007, Marc Perkel wrote:

> John D. Hardin wrote:
> > Can anyone recommend a non-abusive way to validate email addresses?
> 
> Yes - Sender Address Verification (SAV) works very well. It is not 
> abusive. Especially the way Exim implements it.

I am not necessarily speaking of the context of a MTA.

Example pulled out of thin air: if you had a corpus and you wanted to 
check the addresses within it, what would be a "polite" way to do so? 
Just open an SMTP connection and see what the far end says to "RCPT 
TO:", but put a tight rate limit on it?

--
 John Hardin KA7OHZ                    http://www.impsec.org/~jhardin/
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