[Dovecot] what best for anti-spam filter?

[Noel Butler]

On Tue, 2012-07-24 at 11:12 +0200, Warren Baker wrote:

> On Tue, Jul 24, 2012 at 10:49 AM, Morten Stevens
> <mstevens at imt-systems.com> wrote:
> > No, greylisting is really a bad solution. It is not RFC compliant and delays
> > the mail traffic.
> 
> Since when? RFC5321 was updated to handle delays and then there is RFC6647.
> 


When we looked at it years ago, it did little to stem the tide of spam,
all it did was over give us a negative impact by delays of legit mail,
some servers are also poorly configured and dont try resend for a long
period of time, especially if their queue is also loaded up, then
there's non compliant twits like a certain freemail service that does
not retry, period. Too many downfalls, it lasted all of a few days when
we tried it out. It might be acceptable for small SOHO, but it is
unacceptable for ISP's and hosting companies who process millions of
mails a day.

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