On Fri, Sep 11, 2026 at 2:05 AM Benoît Panizzon via mailop
<[email protected]> wrote:

> I can still find the email email in question in our logs, but when it
> was sent to 10 recipients with @hotmail.com or @outlook.com I can't
> tell our customer which one of his recipients reported his email as
> spam. And those are clearly false positives - some recipients still
> confuse 'junk' and 'trash'.
>
> How do you handle such cases? Any contact @ Microsoft which could
> restore the old behaviour of disclosing the recipient which reported
> the email?

ESPs handle this by encoding a copy of the recipient's email address
into an opaque identifier in a hidden header or the message-ID header,
or an unsub link. Which means a unique message for each recipient. It
can be painful for some use cases, but if you can figure it out, it
should address the problem.

Cheers,
Al Iverson

-- 

Al Iverson // 312-725-0130 // Chicago
http://www.spamresource.com // Deliverability
http://www.aliverson.com // All about me
https://xnnd.com/calendar // Book my calendar
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