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mask modifier description

2005-03-26 14:31:27
A mask modifier behaves like an ip4 mechanism would if SPF had 
included a negation.  For instance:

m=-65/8

would be 

-ip4:!65/8  # NOTE - ficticious syntax, '!' not in SPF spec

Since it is a modifier, it must also be possible to ignore it without 
changing the result.  

I don't know if Radu intended this, but the mask modifier should also be
position dependent.  If supported by a checker, it should be evaluated
when encountered.  This makes it the responsibility of the SPF compiler or
human record designer to place the modifier appropriately (e.g. after A
and MX mechanisms).  This simplifies checking software.

-- 
              Stuart D. Gathman <stuart(_at_)bmsi(_dot_)com>
    Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flamis acribus addictis" - background song for
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