Cannot receive Inbound Emails, but Outbound messaging is working well

[a***@discussions.microsoft.com]

Hello-

Windows 2000 Advanced Server and Exchange 5.5 (Sp4). IMS
installed. SMTP Service not running. MX and A records are
in place with ISP. No Proxy nor Firewall. Can ping but
cannot establish Telnet Session from outside of my LAN.
Dig says "Can't connect to Name Server."

When I try to Telnet to port 25 or 110 I get an error
which says "connection actively refused by host."

Can someone tell me what I need to do to resolve? That
is, how do I resolve connection failures/refusals on
Server ports 25 and 110?

Thank you in advance for your assistance on this matter.

Regards

[Waqar Sheikh]

If you are connecting via ADSL/Broadband you need NAT your external IP no to your internal Exchange server IP no on port 110 and port 25.