On Fri, 15 Aug 2014, Dave Warren wrote:

On 2014-08-15 12:05, John Hardin wrote:
 "exists:"? (looks up SPF syntax) (boggle) WTF is the sane use case for
 "exists:"??

With other types of macro expansion, you could query a DNS backend that returns responses from database or algorithmically rather than based on static SPF rules written in DNS as text.

Arguably most of it is needlessly complex in practice, but it's still a neat idea, or would be, if SPF FAIL were universally enforced.

Ah, ok, I didn't think to combine it with macros and such. That makes more sense.

--
 John Hardin KA7OHZ                    http://www.impsec.org/~jhardin/
 jhar...@impsec.org    FALaholic #11174     pgpk -a jhar...@impsec.org
 key: 0xB8732E79 -- 2D8C 34F4 6411 F507 136C  AF76 D822 E6E6 B873 2E79
-----------------------------------------------------------------------
  From the Liberty perspective, it doesn't matter if it's a
  jackboot or a Birkenstock smashing your face.         -- Robb Allen
-----------------------------------------------------------------------
 Today: the 69th anniversary of the end of World War II

Reply via email to