From: Anders Norrbring (listsnorrbring.se)
Date: Mon Jan 28 2008 - 13:16:14 CST

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Victor Duchovni skrev:
> On Mon, Jan 28, 2008 at 07:53:02PM +0100, Anders Norrbring wrote:
>
>> They block 25 to "protect their users against SPAM".
>
> This makes no sense, most ISPs that block port 25 for customer IPs do so
> only outbound. That protects the rest of the world (including to a small
> extent their customers) from spam emanating from botnet machines. But
> blocking of port 25 inbound to a customer IP is in no way an anti-spam
> measure. It prevents one from running an MX host.
>
> Are they really planning to block inbound connections to port 25? Or
> are they just miscommunicating their intentions.
>
> Perhaps they believe that inbound connections on port 25 are delivering
> unwanted Hormel canned meat products.
>

Actually their intention was to only block outbound, but they
misconfigured, and it's "not easy to correct".. *sigh*
Since they're HUGE (Telia), it's not easy for a customer to have them
redo things.

Anders.

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