Stephane Bortzmeyer said the following on 05.12.2004 20:20:
Yet another miracle solution against spam, this time from IBM:
_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.
5791 A8E7 1B44 AF7B 2993 43AF C9D9 77FE 0ED7 0E40