* roughnecks via dovecot:

> It would be nice if said account was not able to receive emails anymore,
> or "better", until it was re-enabled. Would also be cool if the sender
> received a warning back, upon the failed dispatch. [...]

Given that you are using Postfix, employing its recipient address
verification [1] mechanism is one possible method to achieve your goal.

[1] https://www.postfix.org/ADDRESS_VERIFICATION_README.html

Postfix can respond with a 4xx status code ("retry later") for certain
recipients of your choosing, leaving the sender to decide if/when they
want to reconnect at a later time.

-Ralph
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