Re: Spam "from" reserved netblocks

On Fri, 8 Jul 2005 12:31:21 +0000 (UTC), Geoff Lane wrote:

> My interest here is whether mail from a reserved netblock is likely to
> be a legitimate message, and so whether I can legitimately filter on
> reserved netblocks. I don't need to parse anything through Spamcop for
> that because my filters already have the ability to blacklist netblocks.
> If I add 96.0.0.0-123.255.255.255 to the blacklist, anything that
> purports to be from or routed via the RESERVED-8 netblock will get
> dumped into my spam bin - and it would be similar for any other reserved
> netblock that I would add to my blacklist when I discovered spammy using
> it. 

Google on "bogons". It would be a valid filter check, but I have seen IANA
assign blocks from reserved space over time, so using these "bogons" to
filter on would require periodic review of the listed IP address blocks.

> BTW, I can't quite get my head around mailhosts configuration. I have
> potentially an unlimited number of e-mail accounts with a catch-all
> mailbox for each of several domains. AFAICT, you have to configure every
> email address - and that's something I can't do because there are far
> too many fo them. Also, I have intermediate servers between my MUA and
> my ISP's servers, which you can see from the report referenced above.

That wasn't the way I interpreted it. Just one email address per host chain
added.

-- 
Norman
~Shine, bright morning light,
~now in the air the spring is coming.
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~singing down the hills and valleys.