[WIP] Feedback required on... feedback

Main thing of focus here is the way I've integrated the mailer, through a connection in the repository.
Is this needed if the delivery method is [also specified in PseusoSmtpServer](https://github.com/moneyadviceservice/frontend/pull/533/files#diff-7aae6a84886b1a03a2ebbbaf3f575608R15) ?