terry.gilsenaninteroil.com
Date: Tue Jan 01 2008 - 22:44:08 CST

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Terry Carmen wrote:
> Matthias Schmidt wrote:
>>> Bots are pretty easy to kill. You can refuse to talk to them by
>>> matching their reverse DNS against a regular expression.
>>>
>>> This has also been a huge help.
>>>
>> with these rules you might also reject legal eMails from servers running
>> via dyndns, or?
>>
> Dyndns never enters into it. It's looking up the *reverse* DNS, which
> would return the ISP's DN, not the home user.
>
> In any case, I'm more than willing to take a chance on temporarily
> rejecting a few legitimate emails from dynamic IPs in exchange for
> eliminating millions of zombie spams.
>
> If you look at the regexp, you'll note that it contains a reject
> message, which in the case of the companies I manage mail servers for,
> includes a contact phone number for the IT department, so they can be
> white-listed. They generally average maybe a couple of calls a week
> for whitelisting, in contrast to millions of rejects.
>
> Businesses are more than happy to make that trade-off, especially
> since it lowers their risk of infection, spam and scams.
>
> Dynamic users should be routing their mail through their ISPs mail
> servers. If they don't want to, that's fine, but I don't have to talk
> to them.
>
> Terry
>
Bingo!
>
>
>
>
>

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