Forgive me if this is off topic, but I don't know where else to turn. I've got a customer who's having trouble sending mail to two domains with nothing obvious (to me) in common save for one thing; both domain's primary MXen look to be sitting behind Cisco PIX devices with Mailguard turned on. I know this because of the greeting I get from both:
220 ******************************************************************* Now, everything I can find about these devices says that they only allow seven SMTP commands: HELO, MAIL , RCPT , DATA , RSET , NOOP , QUIT And they're supposed to respond with OK to everything else. These two domains, again not obviously related, mail servers in different /8s, don't even do that, though; both of them are responding in unsuspected ways even to commands from the above list, to wit: RSET 500 Syntax error, command unrecognized QUIT 500 Syntax error, command unrecognized I've never wrangled one of these beasts (haven't even *seen* evidence of one in many years) so I'd like to ask you fine folks if you've ever seen anything like this from one of these, and what it means for their configuration? I mean, is this a common bug/misconfiguration, or have I just hit the lottery? Thanks. -- Todd
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