Can anybody explain this? I don't know what's going on at the receiving MTA (i.e. the host name it thinks its talking to is not present anywhere in the dialog) and I don't understand why this is seen by qmail as as temporary error (which is good as such) when the smtp code appears to be 500: 1 2.10 Connected to 164.53.88.23 but my name was rejected./Remote host said: 500 Session already established. The domain name [yankees.cybercon.com] passed in with HELO will be ignored. The current domain name of sending SMTP is [lbmail4.listbot.com]./ 1 1.54 Connected to 164.53.88.23 but my name was rejected./Remote host said: 500 Session already established. The domain name [yankees.cybercon.com] passed in with HELO will be ignored. The current domain name of sending SMTP is [mail.daytimer.com.au]./ 1 1.77 Connected to 164.53.88.23 but my name was rejected./Remote host said: 500 Session already established. The domain name [yankees.cybercon.com] passed in with HELO will be ignored. The current domain name of sending SMTP is [mail6.motleyfool.com]./ [...] the matchup output for the last one of these: d z 935816175.638526 935836917.492611 935836919.267045 22558 <xxxxxxxx-return-5-@ lists.bestnet.net-@[]> [EMAIL PROTECTED] 9485 501 Connected_ to_164.53.88.23_but_my_name_was_rejected./Remote_host_said:_500_Session_ already_ established._The_domain_name_[yankees.cybercon.com]_passed_in_with_HELO_ will_be_ ignored._The_current_domain_name_of_sending_SMTP_is_[mail6.motleyfool.co m]./ [xxxxxx = list name, yyyyyy = recipient local name] telnet to 164.53.88.23 smtp: 220 smtpnag01.national.com.au Lotus SMTP MTA Service Ready helo dimwhit 250 smtpnag01.national.com.au Thanks for any insights! -Sincerely, Fred (Frederik Lindberg, Infectious Diseases, WashU, St. Louis, MO, USA)