Stephane Bortzmeyer said the following on 05.12.2004 20:20:
Yet another miracle solution against spam, this time from IBM:
http://www.alphaworks.ibm.com/tech/fairuce
http://www.alphaworks.ibm.com/aw.nsf/FAQs/fairuce
_FairUCE only sends a challenge when the mail appears to be spoofed_
Oh, no! :(
Not a lot of technical details, unfortunately. It looks like they are
doing SPF without the actual SPF record, just by guessing what the SPF
record could be.
--
motto
5791 A8E7 1B44 AF7B 2993 43AF C9D9 77FE 0ED7 0E40