Sendmail: How does one blacklist annoying spammers?

[Ed Greshko]

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.

-- 
Barometer, n.: An ingenious instrument which indicates what kind of
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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