Sendmail: How does one blacklist annoying spammers?

Ed Greshko Ed.Greshko at
Mon Jun 28 04:05:37 UTC 2010

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....              300     IN      TXT     "v=spf1"

which becomes...        300     IN      TXT     "v=spf1
ip4: ip4: ip4:
ip4: ip4: ip4:
ip4: ip4: ip4:
ip4: ?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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