Possibly not relevant Re: [exim/exim] [Bug]: Exim 4.99.4: Possible duplicate Gmail deliveries caused by SMTP/TLS session completion issue (Issue #3229)

On Wed, 3 Jun 2026, dhayfield via Exim-dev wrote:

> Emails received from Gmail are duplicating, specifically only Gmail
> ( Non-Gmail accounts are unaffected ).

This may be a red-herrring (ie a different issue).

For over a year I have been getting duplicate dmarc reports from gmail.
Looking at the headers (both last year and this) the duplication
happens early as the message makes its way through gmail's servers
- certainly before the DMARC headers are added by (different) google machines.

I typically receive the first copy several minutes before the first
Received/X-Received header is added to the second copy,
so it is possible that a "sending failed" message has got
back to the originating machine.

Is there anything in the headers timestamps of the new duplicates
that might shed any light ?

-- 
Andrew C. Aitchison                      Kendal, UK
                    [email protected]