[opendmarc-users] OpenDMARC useless with Postfix

[Al Iverson]

On Thu, Sep 18, 2014 at 12:16 PM, Joachim Fahrner <jf at fahrner.name> wrote:
> Am Donnerstag, den 18.09.2014, 12:06 -0500 schrieb Al Iverson:
>
>> OpenDKIM + OpenDMARC seems to be working just fine for me on Postfix.
>
> How do you notice that? DMARC has only an effect if the sender domain
> has a reject policy and SPF fails. Thats very rare!!!
>
> Try the following: create a dmarc dns record with p=reject for your
> domain (spamresource.com), then post to this list. The list makes spf
> fail and when dkim is also failing you will get a reject.
>
> Currently your domain has p=none, that will never make you trouble.

I am sorry. I must decline to break my domain to prove your point.

When I first set up my spamtrap accepting server, I enabled DMARC with
Postfix just to sit and watch spam attempts bounce due to DMARC
failures. It certainly seemed to be working at that time.

Cheers,
Al Iverson