> On 02.06.2023 at 10:22 Johan Lavsund via mailop wrote:
> Hi Oliver,
>
> Can you try adding a ; to the end of the dns record?


> On 02.06.2023 at 10:23 Taavi Eomäe via mailop wrote:
>
> Your DKIM TXT record seems valid, but does not specify the key type, looking 
> at the length it should probably contain "k=rsa". Or they might not like you 
> specifying acceptable hash algorithms.
>
> Your mta-sts.txt does not have a trailing newline, I'm not sure if the 
> standard mandates it, but that seems to be at least one of the differences.

Thank you all for the recommendations. I‘m going to add a semicolon to the 
_mta-sts entry, just to see if this alone makes a difference to that validator, 
although RFC8461 describes a trailing semicolon as optional.

I could do the same with k=rsa in the DKIM record, but as mentioned by Benny 
Pedersen this tag is optional as well and rsa is the default value anyway.
While I agree that you should be strict in what you send and liberal in what 
you receive, I‘d say that adding superfluous tags makes a policy less robust 
and not more, as it introduces additional fields which the other party might 
trip over.

The DKIM record of John Levines domain is reported as invalid too, while you 
should think that he knows his way around DKIM. So in the end this Google tool 
might in fact be buggy.

—
BR Oliver
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