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[steacha]

Up to this point, all the computers on the network accessed the e-mail server via the Windows name of the PC running the e-mail server.  However, one of the PCs will need to access e-mail from the WAN soon as opposed to the LAN, so I switched the server name in Thunderbird (e-mail client) to the actually fully qualified domain name of the server (registered at NO-IP, which redirects to the e-mail server at home).

The problem I am running into is that all the requests sent for IMAP or SMTP are being blocked by the router.  That's even though I added port forwarding rules for them.  The logs show messages similar to the following:

"Blocked incoming TCP connection request from 216.168.101.68:51291 to 216.168.101.68:143"

It doesn't make a difference if I change the endpoint filtering to "Endpoint Independent" either.  Any thoughts of what else I can try?  DMZ is not an option.

[FurryNutz]

What Hardware version is your router? Look at sticker under router.
What Firmware version is currently loaded? Found on routers web page under status.
What region are you located?
Are you wired or wireless connected to the router?

What ISP Service do you have? Cable or DSL?
What ISP Modem do you have? Stand Alone or built in router?
What ISP Modem make and model do you have?
If this modem has a built in router, it's best to bridge the modem. Having 2 routers on the same line can cause connection problems.
To tell if the modem is bridged or not, look at the routers web page, Status/Device Info/Wan Section, if there is a 192.168.0.# address in the WAN IP address field, then the modem is not bridged.

Some things to try:
Turn off ALL QoS or Disable Traffic Shaping (DIR only) GameFuel (DGL only and if ON.) options. Advanced/QoS or Gamefuel.
Turn off Advanced DNS Services if you have this option under Setup/Internet/Manual.
Turn on DNS Relay under Setup/Networking.
Setup DHCP reserved IP addresses for all devices ON the router. Setup/Networking
Ensure devices are set to auto obtain an IP address.

[davevt31]

Looks like you are running into a loopback situation, not sure if it can be fixed.