Continuing the discussion from Testing team - how to deal with in Forum:
It appears not possible according to [this
thread].(Email response as private message - support - Discourse Meta)
This leaves 2 options:
- conversation by email (if address is known)
- post “hey @deeplow, PM me!” once, and then keep using that PM thread
for that person
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This ^
Also it seems it’s possible to start a PM from the forum to any email address regardless whether or not they are registered. But not the other way around, unfortunately, it seems: Send a Personal Message to an Email Address - announcements - Discourse Meta