Sometime big mail provider like yahoo and hotmail check if your smtp host is
registered correctly with reverse dns lookup name, some even check if your
smtp host is whitelisted...
so first ensure you have reverse dns lookup name setup for you box, if you
still get the same problem, try contact yahoo.
--
Regards,
Bernard Cheah
http://www.iis.net/
http://www.iis-resources.com/
http://msmvps.com/blogs/bernard/
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