Re: Sendmail: How does one blacklist annoying spammers?

[James Matthews <nytrokiss@xxxxxxxxx>]

Using open source tools is one thing. Google uses a combination of open and closed source anti spam tools. Since Gmail is so popular google is able to sample spam and learn to protect it from the get go....

On Sun, Jun 27, 2010 at 9:05 PM, Ed Greshko <Ed.Greshko@xxxxxxxxxxx> wrote:

On 06/28/2010 11:56 AM, Tim wrote:
> Only a few thousand?  What do you think is a huge list?  And that's just
> your list of mail servers for one service...  What about the other ISPs,
> the thousands of them?
>

Having a look at the SPF records....

gmail.com.              300     IN      TXT     "v=spf1
redirect=_spf.google.com"

which becomes...

_spf.google.com.        300     IN      TXT     "v=spf1
ip4:216.239.32.0/19 ip4:64.233.160.0/19 ip4:66.249.80.0/20
ip4:72.14.192.0/18 ip4:209.85.128.0/17 ip4:66.102.0.0/20
ip4:74.125.0.0/16 ip4:64.18.0.0/20 ip4:207.126.144.0/20
ip4:173.194.0.0/16 ?all"

and therefore totals to a potential +212K "approved" sending hosts.

But, as far as the SPF processing is concerned....note the ?all at the end.

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weather we are having. -- Ambrose Bierce, "The Devil's Dictionary" 葛斯
克 愛德華 / 台北市八德路四段


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