If any of those mailing lists are open, regular lists that I could be 
subscribed to, for testing, I’d be happy to try to do so to validate this for 
you.

-Dan

> On May 9, 2025, at 21:07, Nick Tait via Postfix-users 
> <postfix-users@postfix.org> wrote:
> 
> On 10/05/2025 15:29, Nick Tait via Postfix-users wrote:
>> But of course if the first scenario still exhibits the issue, then that 
>> probably disproves my theory immediately?
> 
> Just thinking a bit more about this... If the first test fails, then you can 
> compare the headers and body in the received email with what you sent in the 
> raw email text file, to see if there have been any changes made in-transit. 
> If there aren't any differences, then the most likely explanation for the 
> DKIM failure would have to be a DNS issue - i.e. the server validating the 
> DKIM signature isn't getting the right data when querying for the DKIM 
> selector? In that case you might look at whether you get different results 
> when you query the TXT record (e.g. with "dig" tool) using your local 
> resolver vs. using 8.8.8.8 (for example)?
> 
> Nick.
> 
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