Andreas, Cisco PIX has this behaviour when using 'fixup protocol smtp'. http://www.cisco.com/univercd/cc/td/doc/product/iaabu/pix/pix_sw/v_63/cm dref/df.htm#1067379 "The fixup protocol smtp command enables the Mail Guard feature, which only lets mail servers receive the RFC 821, section 4.5.1, commands of HELO, MAIL, RCPT, DATA, RSET, NOOP, and QUIT. All other commands are translated into X's which are rejected by the internal server. This results in a message such as "500 Command unknown: 'XXX'." Incomplete commands are discarded.=20 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."
Lars -----Original Message----- From: Andreas Hansson [mailto:[EMAIL PROTECTED] Sent: 18. september 2003 18:55 To: [EMAIL PROTECTED] Subject: [xmail] Re: dnsreport question Ah, is this well known behaviour from some particular firewall? I know our internet provider has a firewall set up, and it does indeed seem like that could be the thing. When contacting the server internally, I get: 220 <[EMAIL PROTECTED]> [XMail 1.10 (Win32/Ix86) ESMTP Server] se rvice ready; Thu, 18 Sep 2003 18:50:50 +0200 HELO ANDREAS 250 briljant.se While from outside the firewall: 220 **0***0**************************************0 *****2************************************************200********2***020 0 HELO ANDREAS 250 briljant.se That firewall seems to be taking the liberty to "anonymize" our mail servers response. Thanks for the quick explanation! Andreas - To unsubscribe from this list: send the line "unsubscribe xmail" in the body of a message to [EMAIL PROTECTED] For general help: send the line "help" in the body of a message to [EMAIL PROTECTED] - To unsubscribe from this list: send the line "unsubscribe xmail" in the body of a message to [EMAIL PROTECTED] For general help: send the line "help" in the body of a message to [EMAIL PROTECTED]
