I just tried to reply to a task by email, and received an error:

The response from the remote server was:
550 5.1.1 <T15026+8+fae183ccf592b05a@secure.phorge.dev>: Recipient address rejected: User unknown in local recipient table

the "From" and "Reply to" fields in our emails are in the @secure.phorge.dev domain, which we should probably change; However the error is "recipient unknown", which implies that there is a mail server (smtp?) at that address, but it's not configured correctly.