How to transfer port in to port out, Mail port 25 blocked

[JohnWLenz]

Router RV042G

I am building MS Exchange server with Comcast as my IPS. Comcast blocks inbound port  25. I have a mail hop service that intercepts port 25 and transfers it to port 2525.

What I need to know is how to have the router accept port 2525 and transfer it to port 25. I have tried port triggering but the doc is confusing, I read it to say it is for outbound, not inbound. I have the port forwarding rule for port 25 set up to send to the internal IP address of Exchange.

Here is the rule:  Trigger port is 25; Incoming port is 2525. However, I do not receive inbound test eMail to the Exchange Server, I can send eMail from Exchange just fine.

What I need to figure out is how to get 2525 to 25.

Assistance appreciated.

BTW

My old Linksys consumer router could do this until it died.

John

[Michael Vandergrift]

Hello John,

Good afternoon, I hope you are doing well.  From what you explain is sounds like you need to do a port forward with translation.  Traffic hitting the router on port 2525 will be sent to your exchange sever on port 25.  You can accomplish this by configuring UPnP.

Setup > UPnP

-function Yes

Service Management

-Service Name: SMTP-Trans

-Protocol: TCP

-External Port: 2525

-Internal Port: 25

Add to list - OK

Select the service you created from the drop-down list.

Name or IP Address: x.x.x.x (the IP address of the exchange server)

Enable

Add to list - Save.

Regards,

Mike.V