I have a Windows 2003 SBS Server running Exchange 2003.
When I view the Queues using Exchange System Manager there a over 50 "Smallbusiness SMT connector - <adomain.com> (SMTP Connector)" where <adomain.com> is all kinds of names nothing to do with me. Each one has a message or two in them. The number in the list keeps growing
When I look in C:\Program Files\Exchsrvr\Mailroot\vsi 1\Queue there are always 20 or so EML files which when I open them usually say they are Delivery Status Notifications of failure to deliver to an unknown address on my domain. Something or someone is obviously crteating this stuff but I can't think where to start to look.