victor duchovni dxdewmdieulnutmorganstanleycom 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 httpwwwpostfixorgpostconf5htmlsmtp_pix_workaround_maps httpwwwpostfixorgpostconf5htmlsmtp_pix_workarounds viktor disclaimer offlist followups get onlist replies get ignored please ignore replyto header unsubscribe postfixusers list visit httpwwwpostfixorglistshtml click link response solves problem best way thank send worked thanks followup must respond please put worked thanks subject delete quickly fri 08 aug 2008 072006 0500 postfix using correct command helo vs ehlo