mail delivery

[Csanyi Pal <csanyipal@csanyipal.info>]

Hello!

I try to send a mail to Roberto but get the following error message:

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) 
failed:

  roberto@familiasanchez.net
    SMTP error from remote mailer after RCPT 
TO:<roberto@familiasanchez.net>:
    host santiago.familiasanchez.net [66.93.22.254]:
    504 <debian-csp>: Helo command rejected: need fully-qualified hostname

I use exim4 on my Debian system with exim4-daemon-heavy.

How can I solve this problem?

Thanks for any advice!

-- 
Regards, Csányi Paul
http://www.ektf.hu/~Csanyi.Pal (Up to now, it is in Hungarian only.)
http://csanyipal.info/moodle  <<<---  Moodle - Course Management System
http://csanyipal.info:81      <<<---  sTeam - Cooperative Learning