Re: [dmarc-ietf] Nitpicky questions about DMARC record syntax

[Dave Crocker <[e-mail]>]

On 1/15/2019 4:58 PM, John Levine wrote:
> I am staring at RFC 7489, and at a bunch of purported DMARC records
> (see previous message.)
> 
> The RFC says that all records must start with "v=DMARC1".  Is it OK
> if they start with "v=dmarc1"?  It says that record is a DKIM tag-value
> list, and the DKIM ABBF defines all the characters with hex escapes
> rather than letters which tells me that it's specifically saying
> that case matters.
> 
> How about if there's a space before the v=DMARC1?  The tag-value syntax
> allows FWS before the first tag, but 7489 says in several places


The formal specification is quite clear on both of your questions:

    Section 6.4:

    dmarc-version   = "v" *WSP "=" *WSP %x44 %x4d %x41 %x52 %x43 %x31


which means that the white space is required to be allowed and the value 
in this tag-value is case sensitive.

d/

-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net