Re: [exim] DMARC and Exim

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Autor: exim-users
Data:  
Para: exim-users
Asunto: Re: [exim] DMARC and Exim
On 31/01/12 09:32, Oliver Howe wrote:

> Does anyone have any experience of using DMARC?


Nope.

> See http://dmarc.org/overview.html


Looks interesting.

> http://www.returnpath.net/blog/intheknow/2012/01/return-path-joins-with-gmail-aol-yahoo-and-microsoft-to-found-dmarc-org-to-help-safeguard-consumers-brands-and-isps-from-phishing/
> and http://returnpath.net/commercialsender/domainassurance/dmarc/
>
> It looks like it is some kind of DNS record that checks if a domain
> has SPF and DKIM. If so, I guess a filter could be added to my inbound
> SMTP servers so that messages are actioned according to the DMARC
> policy (quarentine, reject etc) returned by the sender domains DNS
> record.


My SPF record already states that *all* email from my domain must come
from a certain server, and the ADSP record for my domain already states
that *all* email from my domain must have a valid DKIM signature:

mike@alfa:~$ dig +short txt grepular.com
"v=spf1 include:spf.grepular.com -all"
mike@alfa:~$ dig +short txt _adsp._domainkey.grepular.com
"dkim=all"
mike@alfa:~$

-- 
Mike Cardwell  https://grepular.com/     http://cardwellit.com/
OpenPGP Key    35BC AF1D 3AA2 1F84 3DC3  B0CF 70A5 F512 0018 461F
XMPP OTR Key   8924 B06A 7917 AAF3 DBB1  BF1B 295C 3C78 3EF1 46B4