Re: [exim] Has anyone done this?

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Author: Phil Brutsche
Date:  
To: Marc Perkel
CC: exim-users
Subject: Re: [exim] Has anyone done this?
There are many, many legitimate mail sources that do not run MTAs on
their outbound mail hosts:

* Hotmail
* Nortel Networks
* Cisco
* Yahoo
* Cox Communications

I'm sure there are more than that, I don't feel like digging through my
mail server logs to find them.

Personally, I wouldn't rely on such a check alone to reject mail - maybe
in conjunction with white lists and/or greylisting, but that's a
*strong* "maybe".

But I'm sure you've heard "your server, your rules" before :D

Marc Perkel wrote:
> I had a friend make an interesting suggestion. He said, "Why not
> check the sending IP to see if it can receive anything on port 25?"
> The idea being that a spammer might be sending on port 25 but can't
> receive anying on port 25.
>
> Has anyone try this?


--

Phil Brutsche
phil@???