SPF delegation

I'm sure someone has already thought of this, but I just set up a 
delegation system for SPF records.  When SPF returns none, I lookup the
domain under _spf.delgate.com to see if one is supplied.  This lets me
supply SPF records for use by my customers for domains which won't provide
them themselves.

For example, delegate is myserver.com, email domain is foobar.com,
if standard SPF lookup for foobar.com returns none, I lookup
foobar.com._spf.myserver.com and use that instead if it exists.


-- 
                        Stuart D. Gathman <stuart(_at_)bmsi(_dot_)com>
      Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
      "Very few of our customers are going to have a pure Unix
      or pure Windows environment." - Dennis Oldroyd, Microsoft Corporation