Re: Blocking spam by IP number
On Thu, 14 Aug 1997, Remco van de Meent wrote:
> On Thu, 14 Aug 1997, David Sewell wrote:
>
> : I think a Debian spam-blocking package, using TCPD and generalized
> : to cover all MTAs, would be a good thing, with a couple of caveats.
>
> That's quite difficult to implement.
>
> One of the most important reasons: not all MTA are using
> tcpserver/inetd/xinetd as their 'parent'. For example ZMailer and
> Sendmail do create their own serversocket. (Yes I know, both of them
> have options to make them spawned by inetd).
that's one of the reasons i prefer packet filtering to tcp-wrappers.
block it out in the kernel before it gets to the application level.
btw, sendmail can be compiled to use tcp wrappers. I think it's the
-DTCP_WRAPPERS compile time option or something like that.
> Another reason that you don't want to use (imho) tcpd as a spamfilter: I
> like to 'filter' messages on more than just the other end's IP-address.
> I know ZMailer supports additional blocking:
> - source address (ip)
> - HELO line
> - MAIL line
> - RCPT line
> - existance of a valid DNS-entry in the several lines
can any of the MTAs reject mail based on arbitrary headers? or even just
the To: header (e.g. "To: friend@public.com")?
I know i can do this easily enough with procmail (in fact, I do), but
IMO this is a job for the mail transfer agent, not the delivery agent.
craig
--
craig sanders
networking consultant Available for casual or contract
temporary autonomous zone system administration tasks.
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