kirm,

have you tried that your isp server...

telnet to it's port 25

if it gives you a connection, it might ask for helo-ehlo, but after that write the rcpt to and mail from things with your own internal address and see if it lets the mail come true.

if there is good security, it does not let it, but try.
I don't remember the correct keywords, but they are there in my smtp-mail udf.

if it accepts the addresses post some crap.
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