17 Feb
2014
17 Feb
'14
8:59 p.m.
Alun said:
AFAIK greylisting *is* RFC compliant. It's
leveraging the standards
in a compliant manner to the disadvantage of non-compliant software
(i.e. spamware). RFC2821 says the following:
Beat me to it :)
An earlier email RFC said it should work, i.e. the sender "SHOULD"
resend, and now it 'must' to be RFC-compliant.
The biggest justifiable evilness of greylisting is in
expecting other
sites to do more work in getting mail to you.
I think it's hoping that not everyone implements it and gets the
benefits! If everyone greylisted, it would stop working as the spambots
would have to be made compliant.
Fortunately, they don't, so they're not, so it works.
Ian