I have an SBS 2008 server set up to retrieve POP3 email from an outside domain. The POP3 works fine on receive and the workstations Outlook is working perfectly to retrieve the email.
I don't think I have the SMTP connector set up right. They get emails back with this below when they send from their workstations.
#550 4.4.7 QUEUE.Expired; message expired in unreachable destination queue. Reason: A matching connector cannot be found to route the external recipient ##
Thank you in advance for your help!
I should mention that I do not believe I need a smart host. When I configure the POP3 email right on the workstation only I do not need anything to do with the ISP.