How to redirect all traffic coming to port 25 to another public ip, port 26

Hi all...

My ISP blocks port 25 but I have another server that doesn't have the problem.

I would like to install my own mail server anyway so I thought that being able to redirect all traffic going to port 25 of SERVER A to port 26 of SERVER B would do the trick.

Is this something I can do with a Fritzbox? How?

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It sounds like you're not telling something here. Are the two servers behind different public IP addresses on the same ISP?
Lee W, MVPTechnology and Business Process AdvisorCommented:
If the ISP blocks the port you can't tell every other server on the internet to use a different port to communicate with you.  You can potentially use a third party service that would forward ports for you - something (I believe) like Dynamic DNS ( can accept mail for you on the standard ports and then forward it to your server using the alternate ports.
Hemil AquinoNetwork EngineerCommented:
In my experience, do what I do, call your ISP provider and tell them to unblock the port 25 on your private address. "Guessing you have a business plan" they will do that.
in fact they will give you a link to log in and do it yourself.

Now, here is what you can do, IF you are hosting your own server.

1- Install your mail server.
2- create a connector to recieve email binding the port 26 giving the right permission.
3- Allow the port in your firewall to be natted by the server IP.
4- You should be all set.

This is what is going to happen.

when the client tries to communicate with your server, it sends the data out with the source and destination IP embedded with the port number, when your firewall check the packet, it forwards to it's destination port and destination IP address. The server receives the data and reply back. Does that make sense.

I have done it with exchange server, but I dont know about "Fritzbox?"

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ltpittAuthor Commented:
Mail reflector did the trick.

Thanks for pointing me in the right direction!
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