Hello:
I'm not sure, but I think it's by looking at the header of the message,
not the body, there's a message id like this:
Message-ID: <[EMAIL PROTECTED]>
and this id is unique, so if exists on the inbox, it doesn't downloads the
body.
Best Regards
------------
Visual PHP Studio, RAD development with PHP
http://www.visualphpstudio.f2s.com
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