Sun, 22 Feb 2004 07:48:17 -0600.
             <200402221348.i1MDmHNr024877@guild.plethora.net> 
 > In my experience, even if you can't do it directly, it seems to just about
 > always be possible to ensure that mail comes out with valid and matching
 > reverse DNS.  It may require leaning on a meta-sysadmin, but it's generally
 > doable.

I tried leaning through the layers at Telia.  The upper layers keep
quoting policy....  I finally found a sympathetic sysadmin who 
claimed to delegate the records to me.  She only did it on one of their
nameservers so now when you lookup the PTR's of my mailserver, you
only occasionally get a name.  She left the company shortly there-
after...

My point is, you can radically decrease the amount of spam you get
by filtering on ever more stringent things.  For example, you can 
stop a lot of spam and viruses if you reject all mail from outlook
mail servers.  I suggest you do that too.

 > We're also reaching the point where measures like this are becoming more
 > palatable simply because the volume of legitimate mail lost to them is lower
 > than the volume of legitimate mail lost to not having them...

I seem to do quite well filtering my spam without using this method.