Email vanished from sender and recipient after receipt

Occasional Visitor
An email was sent on monday, to an adress previously never used by my account.
The receipt was confirmed by the recipient on tuesday.
Now, thursday, the email cannot be found either in my or the recipients folders.
It has not been deleted, moved, or archived.
The "last used" memory does remember the only ever once used recipient adress, however the search function returns no email.
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