I am having trouble connecting external clients to use POP3 on an Exchange 2003 server.
If I am internal, or connected over VPN, I can type the name of the incoming mail server as the internal name (ie mailsrvr.domain.local) and everything works with no problems. In this scenario, I am using mail.domain.com as the SMTP server.
If I try to connect an external client however, using this info:
POP3 server: mail.domain.com
SMTP Server: mail.domain.com
I get the following error from Outlook:
"Task 'mail.domain.com - Receiving' reported error (0x80042108) : 'Outlook is unable to connect to your incoming (POP3) email server. If you continue to receive this message, contact your server administrator or Internet service provider.'
We are using a hardware firewall (Linksys R0V42) and I have the following Access Rules configured:
Policy Name: POP3
Policy Name: SSL
The POP3 service is started and the default virtual server is configured for port 110.
I only have Basic authentication and Simple Authentication and Security Layer checked. Requires SSL is NOT checked - though I am using SSL for OWA and Active Sync.
Why else could I not be able to connect to the POP3 connector?