patrick ben koetter bstateofmindde victor duchovni thu mar 06 2008 042605pm 0100 patrick ben koetter wrote telnet smtpcompany1com 25 trying 2315 connected mymailemailhostcom escape character 220 server really introduce course behind pix firewall smtpfup turned would smtp client know server supports esmtp way server tell client supports using string esmtp smtp banner eg like postfix default send ehlo even without esmtp banner sees pix banner apologies lesson learned brick book postfix saslfinger debugging smtp auth fri 08 aug 2008 132127 0100 postfix using correct command helo vs ehlo