Hi,
How about the message in the header saying "may be forged", is it safe
to filter it out?
Also I found in the subject line, it often contains the leading prefix
like
AD:xxxx
SPAM: Best buy .....
Is this some clever server put it for us to make filter easier?
Rgds,
Kwang-Fuh Lee.
Aloha mai Nai`a! wrote
Now, the bigger question: Are you sure this is a good idea?
The 'unknown' means that either:
1) the reverse DNS doesn't exist, as in this case:
$ host 125.180.77.87
Host 87.77.180.125.in-addr.arpa not found: 3(NXDOMAIN)
2) or, that the forward and reverse DNS don't agree.
If you block, or even filter, based on that, you're gonna see false
positives.
Granted, it's a pretty good indicator that someone's not paying
attention to their DNS config, but...
You're gonna see False Positives.
Be ready for it.
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