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Re: SPF and viruses

2004-01-30 07:04:17
"Mark Shewmaker" <mark(_at_)primefactor(_dot_)com> wrote:
Then if someone forges mail from their own IP address:

  o The spf tests for mail froms of "user(_at_)example(_dot_)com" return FAIL.

  o But the spf tests for mail froms of 
"user(_at_)support(_dot_)example(_dot_)com"
    will return UNKNOWN, (even though support.example.com doesn't
    exist and a "host support.example.com" returns NXDOMAIN.)

It's allready a good idea to reject with a temporary error email with an
inexistant FROM domain. That's what I do, and it stops a lot of junk. Check
out my qpsmtpd stats on http://stats.logidac.com/details.cgi the dark blue
bars are non existant from domains.

Cheers,
GFK's
-- 
Guillaume Filion, ing. jr
Logidac Tech., Beaumont, Québec, Canada - http://logidac.com/
PGP Key and more: http://guillaume.filion.org/

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