[PLUG] What is the best way to create a tunnel or a forward? iptables?

[Marc Zucchelli <marcz908@yahoo.com>]

I'm hosting a clients email on my server.  Something went wrong with their router and it's blocking port 25.  I won't have the time to make the long trip up to fix it for them for a while, so I was thinking about maybe openning up a higher port on the same server, and just tunneling that to port 25, and it will be easy enough for me to walk them through changing their outgoing port in their email software.  What is the best way to pull this off?  This is just a temporary solution so I don't lose them!

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