The use of macros in SPF means that the DNS administrator cannot
(always) resolve the includes statically.
In my particular case, I use redirect because the authoritative
nameserver for my domains is a web based one (zoneedit). All my SPF
records redirect to a nameserver that is totally under my control and
where I have no limits on zone, records etc.
Philip
matthew-list(_at_)bytemark(_dot_)co(_dot_)uk wrote:
Likewise for the include directive, why can't the administrator periodically
fetch and update his own SPF records from those he wishes to include? It
would be bad practice for a webmaster to write pages which reference external
resources which aren't under their control; the page the viewer sees may load
unpredictably as a result, or simply break. The good webmaster periodically
fetches and caches external information like news headlines etc. rather than
pointing the viewer somewhere else in hope. Why should DNS servers be
encouraged to do the same?
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