From postfix-users  Mon May 25 12:27:18 2020
From: Patrick Proniewski <patpro () patpro ! net>
Date: Mon, 25 May 2020 12:27:18 +0000
To: postfix-users
Subject: Re: Preferred/maintained greylisting options?
Message-Id: <09219EE2-3569-45A3-9E57-4B951568F08A () patpro ! net>
X-MARC-Message: https://marc.info/?l=postfix-users&m=159040968604017

Hello,

> On 25 mai 2020, at 03:59, Vincent Pelletier <plr.vincent@gmail.com> =
wrote:
>=20
> On Fri, May 22, 2020 at 5:43 AM Ralph Seichter <abbot@monksofcool.net> =
wrote:
>> Yeah, delays... Used to be people understood the difference between
>> asynchronous messaging (i.e. email) and instant messaging. Nowadays =
it
>> seems that no day goes by without somehing along these lines:
>>=20
>>  "Hi. We have not seen you login using this browser, this IP address =
or
>>  during this week. Therefore we have just sent you an email =
containing
>>  a verification code, which will remain valid for 10 minutes."
>=20
> Personally, I've hacked together a mixed SPF check + greylist milter.
> If SPF check passes, the greylist is skipped, and any other result
> ("do not reject any mail" approach modulo greylisting) goes to =
greylist.
> The companies which send such emails are likely (in my experience)
> to have a properly setup SPF, so this solved these issues for me.
>=20
> I'm not planning on releasing the source, it's really an ugly milter, =
but
> I'm putting the idea out here - and maybe I'll learn it has already =
been
> done and properly implemented...


I've been using milter-greylist for a very long time, and it does =
natively support for years a "nospf" config flag that will allow you to =
skip greylist when SPF verification if good. You don't need to hack =
anything ;)

patpro=