I posted this over on the mail enable forum, but no one responded. Can anyone help me here? Thanks Chuck Several of my customers (postoffices/domains) are getting message delivery delay notices from rcn.com/erols.com and cox.net. I'm using Plesk as my control panel with ME 1.72 (or 3, not sure). I was wondering if anyone out there knew what I should be looking for in either the ME settings or my DNS to resolve the issue. The server is windows 2003 and is multihomed with about 20 domains/postoffices. Based on other posts I believe that ME is listening on x.x.x.2 and sending on x.x.x.1. Therefore I have added a secondary MX record in dns with a lower priority (higher number) for reverse lookup purposes. x.x.x.1 is my machine's base ip and x.x.x.2 is my domain's ip. My dns records look like this: same as parent A x.x.x.2 same as parent MX  domain.com same as parent MX  x.x.x.1 SMTP Properties Local Domain Name: x.x.x.1 DNS Addresses: x.x.x.1 external.x.x.1 external.x.x.2 Always bind to all IPs is checked Outbound binding is set to default Should outbound binding be set to x.x.x.1? Thanks for the help.