Ah, but just because it comes from an open relay with a valid DNS entry
doesn't mean the "From:" address is valid. That's what the patch at
qmail.org checks, so it can bounce it to the original sender if it needs to.
The problem I was running into was that we'd get so much SPAM with an
unresolvable From: header that was trying to be delivered to non-existant
users on our system, that it would sit in the queue for a week while it was
trying to bounce it back to that non-existant domain. Then after a week
that would puke out and flood the MAILER-DAEMON or postmaster boxes with
"but the bounce bounced!" messages. I pretty much got sick of it, and
applied the patch, and I haven't been sorry. :)
As long as everyone has their "From:" address configured correctly with
their mail reader, there shouldn't be any problems. If people don't have
that configured correctly, well, they SHOULD. :)
-D
>-----Original Message-----
>From: Michael Boyiazis [mailto:[EMAIL PROTECTED]]
>Sent: Wednesday, June 14, 2000 3:54 PM
>To: [EMAIL PROTECTED]
>Subject: RE: Bouncing mail w/ no reverse DNS
>
>
> > Forgive me if this is somewhere in the Docs, I can't find it.
>>
>> I would like to bounce inbound mail that comes in that can't resolve
>> reverse DNS.
>>
>> A lot of net admins out there have started to not setup DNS
>> entries for
>> their dial-up accounts believing that this is a better approach than
>> registering w/ the MAPS/DUL list.
>>
>> Personally I don't agree... but I'm getting a lot of trespass spam via
>> non resolved DNS.
>>
>> Any ideas?
>
>I tried it for about two days. I had sales people complaining that
>they couldn't get mail from their contacts; I had tech(!) firms' mail
>bouncing back to them; etc.
>
>While some spam comes from these unlisted people, most
>comes from hijacked servers used for relay, which have perfectly
>set up DNS entries.
>
>Michael Boyiazis -----
>[EMAIL PROTECTED]
>
>NetZero
>Mail/Sys/Network Admin
>
>
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