On 26/10/2023 07:25, Mark Alley wrote:
On Wed, Oct 25, 2023, 8:25 PM Jesse Thompson <[email protected]> wrote:Is it advisable to use "t=y pct=0" for backwards compatibility? I'm curious about this as well.I imagine implementation experience with this will vary widely because there's unfortunately no shortage of receivers rolling non-standard DMARC evaluation logic with liberal interpretations of expected syntax and tags, even though the ABNF and section 5.3 are explicit with instruction on how to proceed in those cases.- Mark Alley
I assume there is a semicolon such as 't=y; pct=0'As unknown tags must be ignore in both RFC 7489 and dmarcbis : the unknown tag "t" must be ignored by an RFC 7489 parser. Same for a dmarcbis parser, as the pct tag does not exist anymore, the parser must ignore "pct".
If it is a backward-compatible parser, I would personally ignore the oldest tags : pct.
Regards, Olivier
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