[dmarc-discuss] On Inbound DMARC Support

Franck Martin fmartin at linkedin.com
Fri Jun 20 09:37:17 PDT 2014

If you look at the spec, there is a strong recommendation to have it this way:

 550 5.7.1 Email rejected per DMARC policy for example.com
It should make your internal discussion easier…

We found out that putting the word DMARC in the error message, allows bounce processors at ESPs, mailing lists, to understand there is a mailbox there, just not taking that email...


On Jun 20, 2014, at 2:58 AM, John Mears <John_Mears at symantec.com> wrote:

> Currently we give a generic SMTP error stating that we filtered the email, without giving reasons, ie a fairly opaque message. Actually this is under discussion internally. We need to strike a compromise between being informative to legitimate senders while not revealing the internal workings of our service to other senders.
> John
> -----Original Message-----
> From: Franck Martin [mailto:fmartin at linkedin.com] 
> Sent: 19 June 2014 17:53
> To: John Mears
> Cc: dmarc-discuss at dmarc.org
> Subject: Re: [dmarc-discuss] On Inbound DMARC Support
> On Jun 19, 2014, at 7:14 AM, John Mears via dmarc-discuss <dmarc-discuss at dmarc.org> wrote:
>> I believe there are some announcements expected shortly, and both Symantec and Halon are already offering it as a cloud filtering service. (I think I'm forgetting another service...)
>> --Steve.
>> Indeed, the Symantec hosted email security service now sports a check box for enabling DMARC for inbound  emails. I wrote the code behind it. We are seeing customers gradually enabling it.
> What is the SMTP error message when an email is rejected? I'm curious.

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