[SpamCop-List] Re: OT SPF is harmful. Adopt it
philip at pch.home.cs.vu.nl
Thu Sep 30 12:37:49 EDT 2004
In article <cjgfkr$spb$1 at news.spamcop.net>,
Mike Easter <MikeE at ster.invalid> wrote:
>Philip Homburg wrote:
>> Mike Easter
>>> Reject all msgs from MTAs without PTR, and/or without a HELO
>>> hostname in DNS. If a business MTA cannot get those two
>>> butt-simple, ancient params correct, they have no business sending
>>> to our MXs.
>> When comes it spam, what benefit does it have to force China and
>> Korea to get reverse DNS right?
>The 'issue' behind the above is about getting some compliance and
>behavior; it isn't a new spamfilter. It is a significant existing RFC
>which is being ignored and shouldn't be. Neither should there be
>noncompliant server trace lines, for example.
When it comes to e-mail and when there are no (significant) security
issues, I stick the "Be liberal in what you accept, and conservative in
what you send" motto.
>> I get most spam from the US where zombies tend to have proper reverse
>> DNS entries.
>Yes, but those aren't even MTAs.
When they are sending spam they are MTAs. Maybe not official MTAs according to
the official owner of the box, but MTAs none the less.
>They are dynamics.
RFC-2821 doesn't say anything about dynamic addresses. I don't think
there any official RFC that says something about dynamic addresses. Dynamic
addresses is are just a local policy issue.
>This whole business or thread is about 'rules' or structure for smtp. It
>isn't about spamfilters.
Rules that have no technical justification are just needless complications.
Having a proper reverse DNS is very nice for system administrators, but
that is about it. Most of the time when I want to know something about
an address, I do a whois lookup anyway.
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recorder only had to watch them, of course. It didn't have to believe them all
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