On Tue, 2012-07-24 at 11:12 +0200, Warren Baker wrote: > On Tue, Jul 24, 2012 at 10:49 AM, Morten Stevens > <mstev...@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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