Replying to myself...
I think the reason lots of spammers are abusing Hotmail is this
note in our incident report:
SPF query returned 'pass'
Hotmail publishes SPF records, and I guess spammers hope that a "pass"
will help their mail get through. I've evolved my thinking on SPF so
I use it as follows:
- For domains that I do not control, I add 5 points for "fail" and 2
for "softfail". I never subtract points; I think it's highly dangerous
to subtract points unless you control the domain.
- For domains that I do control, I subtract 2 points for "pass". I don't
add points for fail or softfail, though I guess that wouldn't be dangerous.
Regards,
David.
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