E-Mail wrongly delivered to account given in "Accept unknown recipients"

[uliversal (Uli Gr)]

Thank you @davidep!
Your’re right, this is already reported in the post you mentioned:

@uliversal

But now, additionally, all my mail sent internally to an existing user (using sendmail or dovecot client) is also sent to the account defined in the “accept unknown recipients”.

But for this bug report I have isolated the problem and led it back to a simple and reproducible scenario. I hope this is helpful for solving the problem.