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Cisco 2600 and a Cisco PIX 506E.
Ok, I did a bit of digging and found this:
> As of PIX Firewall software Version 5.1 and higher, the fixup > protocol smtp command changes the characters in the SMTP banner > to asterisks except for the "2", "0", "0 " characters. Carriage > return (CR) and linefeed (LF) characters are ignored.
So, this is why the host name is being masked out.
You *MAY* want to try and shutoff 'fixup' on port 25 and see what happens.
david
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