[Declude.JunkMail] Cheap router to limit by IP

[Matt]

I have yet another customer that is running GroupWise 5x that is getting 
attacked by some asian spammer trying to dictionary attack Yahoo.co.jp 
and other regional sites.  Until they can get onto GroupWise 6 (which 
will reject at the SMTP envelope), my recommendation was for them to 
install a new router capable of limiting port 25 to just my server's IP, 
the only problem is that he needs something fast and cheap.

Does anyone know of any cheap, chain store stocked routers that are 
capable of limiting a particular port to a particular IP on inbound only 
(it still has to deliver by SMTP, just only receive from my IP)?  I 
figure that the following are the best candidates based on the fact that 
they are readily available.

   http://www.compusa.com/products/products.asp?N=200158&CusaNe=200139

Note that he only needs to firewall one port.

BTW, if you are running GroupWise 5.x (including 5.5.5), this asian 
spammer will stick a group of zombies on your machine for weeks on end 
even if in fact your server is not actually relaying the messages.  This 
is the same spammer that is responsible for the majority of the Job-Jobs 
that my locally hosted domains see right now.

Thanks,

Matt

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