Phil Stewart said:
Interestingly, I'm starting to see greylisting
become less effective
as an anti-spam technique.
That's interesting. I'm not noticing any increase in spam getting
through, and the logs still show an awful lot not getting past greylisting.
There are some 'genuine' senders who don't either because their mail
servers don't resend the mail, but these tend to be the ones who don't
accept postmaster@ email either, sigh.
Ian