I have one specific user that cannot receive external email from anywhere. (Internal is fine)
External NDR is: 550 Requested action not taken: mailbox unavailable
I have checked the POP3 Connector - they are listed with the same setting that the rest of the staff are. I can't seem to figure out what other setting needs to be changed.
We are using the following:
Windows SBS 2003, Exchange 2003, POP3 Connector, SB SMTP Connector
I am a little unfamiliar with this type of setup, but it looks like they use both the POP3 connector and the SMTP connector to receive and send email via their web host.
Any ideas on where I could look?