On Tue, 10 Apr 2007, alan wrote:
quoted text
> > 
> > For example, I will personally never see email that comes directly to my
> > email address though an open mail relay *or* from something that appears
> > to be just a random botnet PC (I forget the exact rule, since I'm hapily
> > ignorant of MIS, but I think it boils down to requiring a good reverse DNS
> > lookup).
> 
> Depending on your definition of "good".

Well, the most common case (and the thing I *think* our spam software does 
here) is to just confirm that the reverse DNS lookup (that you want to do 
*anyway* for the "Received" headers for the email) will resolve back to 
the same IP (aka "FCrDNS").

It's also possible to just not accept mail if the reverse lookup indicates 
that the sending IP address is a dynamic address, which you can sometimes 
see from the hostname. I would suggest you *not* name your hosts to 
contain a lot of numbers and the string "dhcp", for example ;)

quoted text
> Sometimes I think the anti-spam methods are as obnoxious as the 
> spammers. Almost.)

I'll take strict anti-spam methods any day. I get about 10 pieces of spam 
a day, that I can handle easily without worrying about it. I shudder to 
even just think about what it used to be like before aggressive spam 
filtering.

So I'm personally *solidly* in the camp that says "if you want to send me 
email, it's worth making a conscious effort to not look like spam".

		Linus
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