On Thu, 27 Aug 2009 16:55:15 +0200 Morten W. Petersen wrote:
> Hi,
> 
> I'm trying to use an external python script to verify that a remote SMTP 
> host
> can accept a recipient.  Using Exim's callout didn't work (getting too many
> write lock issues).

Have you ever heard of "recipient callout verification?
If not you should read 
http://www.exim.org/exim-html-current/doc/html/spec_html/ch40.html#SECTcallver

--Frank Elsner

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