From postfix-users  Wed May 27 01:09:17 2020
From: Doug Hardie <bc979 () lafn ! org>
Date: Wed, 27 May 2020 01:09:17 +0000
To: postfix-users
Subject: Re: Preferred/maintained greylisting options?
Message-Id: <ED6AC72A-050E-48E7-BE94-1A9F5C157E83 () mail ! sermon-archive ! info>
X-MARC-Message: https://marc.info/?l=postfix-users&m=159054179916718

> On 25 May 2020, at 12:00, Chris Wedgwood <cw@f00f.org> wrote:
>=20
>> Greylisting has become pretty much useless.  When I disabled it a
>> couple years ago, the spam levers did not increase by any measurable
>> amount.  We now use just 3 RBLs and that seems to be a relatively
>> acceptable level of spam.
>=20
> Checking for %ge of messages that "return after defer" I see:
>=20
>    WeekOf      PctReturned
>    ----------  -----------
>    2020-04-30  22.1
>    2020-05-07  26.5
>    2020-05-14  21.2
>    2020-05-21  26.5

I would guess that our users were hit by spammers with more resources =
;-)  I would have kept greylisting if we had seen numbers like that.

-- Doug