Gitlab email replies?

Hi y’all! I just tried responding to a Gitlab issue thread via email reply, and got a mail system failure –

<>: host[] said: 550 5.1.1
    <>: Recipient
    address rejected: User unknown in relay recipient table (in reply to RCPT
    TO command)

Does something else need to be configured still for to accept email replies?

Woops! This is a bug. Would you mind opening a ticket at I think that’s where we’d want to track this kind of thing.

Just created the issue ticket now. And hilariously, my initial reply to this topic saying just “Done!” was also rejected by the discourse server for being too short!