Transparent SMTP proxies?

[Bill McGonigle]

On Jan 22, 2008, at 16:19, Ben Scott wrote:

>   Idea for an alternative strategy: Use IPtables to intercept all
> TCP/25 traffic and redirect it to your existing SMTP relay server.

I think this will hose up anybody configured to do SMTP AUTH if it  
runs through a 'regular' SMTP relay.  My assumption is that the  
transparent proxies do AUTH-by-proxy for them (if you don't want me  
potentially logging your password, please stop sending it in cleartext).

The port re-direct is going to be essential, as I don't want to put  
another SPOF in the way (nor burn significantly more electrons).

> Most bitty boxes (like WAPs) don't have many computrons to spare, so
> that might be a good idea anyway.

True - I figured I'd alias up an eth0:x interface on my 'network'  
server and run the proxy there.  So far, it works in theory. :)

-Bill

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