I am running the VMTN of the ISP Config running on Debian. Everything is functioning, but the system is still named server1.example.com. I would like it to be mail.cass.lib.mi.us. Where do I need to change this? My outgoing mail is being rejected because: the host gateway-a.comcast.net[18.104.22.168] said: 521-EHLO/HELO from sender 22.214.171.124 does not map to server1.example.com in DNS 521-sending machine name must be provided as a fully 521-qualified domain via EHLO/HELO command. 521-see section 126.96.36.199 and 4.1.4 of RFC 2821 521 521: Please see http://www.comcast.net/help/faq/index.jsp?faq=SecurityMail_Policy18784 for more information. Thank You for your help.