I would look at the headers for the email sent to see if it really is using the youraccount@gmail.com email address instead of a make.com email address. That would explain the problem.
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I was logged in in Make with Google account Y.
The email config is for Google account X.
I logged in with Google account X and it seems to be working but ONLY if I send it to Google account X.
To other email addresses, I doesnt send out (and no error message)