Hello, I'm in trouble. Mailman can't send any messages (when I tell him to send a notification to new user when I use http://lists.mydomain.com). here is my : /var/log/mailman/smtp-failure Mar 03 19:34:28 2007 (22656) Low level smtp error: (-2, 'Name or service not known'), msgid: <email@example.com> Mar 03 19:34:28 2007 (22656) delivery to firstname.lastname@example.org failed with code -1: (-2, 'Name or service not known') What should I do ? I think SMTP works correctly because Horde IMP (http://webmail.domain.net) works great ... Anyone can help me ?