[KLUG Members] sbc blocking port 25

[Adam Tauno Williams]

> For some odd reason, tech support wanted me to list -all- the email
> servers I may send to, which is a list too big to remember (no I send no
> spam).  She assured me that any server I didn't list would get blocked. 
> So they'll filter port 25 only allowing listed servers?  I'll check on
> that and report later.

Any news?  Maintaining an allow list for clients seems like a great deal
of work on their side.  They aren't blocking my Business DSL, yet.

> The other thing you can do, if you have access to your sendmail servers
> on linux (of course), is tweak iptables.
> Let's say you want the server to use port 2525 (it will still accept
> port 25), and your server ip is 12.34.56.78.  you can add this line: 
> -A PREROUTING -p tcp -m tcp --dport 2525 -j DNAT --to-destination
> 12.34.56.78:25

But that doesn't really help people trying to deliver too you.
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