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Date: Sun, 7 Aug 2016 20:15:09 +0200
From: Niklaas Baudet von Gersdorff <stdin@niklaas.eu>
To: freebsd-questions@freebsd.org, owner-freebsd-questions@freebsd.org
Subject: Re: Need advice for setting up mail server
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Solène Rapenne [2016-08-07 20:10 +0200] :

> I have had issues with SPF since last year for a lot of servers (not
> necessaries one of big companies) and I have been rejected recently of some
> servers because I wasn't using DKIM. Even if it works without them, you need
> to be aware of their existence in case you are rejected.

I guess I have been quite lucky so far. :-) You're right though,
you need to know about it.

> This is a problem with greylisting but this could be "fixed" with a script
> running every minute whitelisting servers of known domains checked by
> reverse dns resolving. It will still add delay because the server need to
> retry the sending but it works.

Just another resource about this:

  https://calomel.org/spamd_config.html

    Niklaas