Replies from incorrect email address report different error

Requirements

Reply by email setting must be enabled
Reply by email address setting must have an appropriate address including the reply key
The instance must be able to receive emails

Steps to reproduce

  1. Register an account using an email address that you can receive emails at
  2. Watch a category or topic
  3. Create a post that will result in that user receiving an email notification
  4. Reply to the notification email from a different address than the one used to register

Expected result

Email is rejected with Email::Receiver::ReplyUserNotMatchingError

Actual result

Email is rejected with Email::Receiver::BadDestinationAddress