Disable and opt out emails when we receive information saying the email is bad [MJ-382]
Move tests to the correct file
Create message for users that have been deactivated due to SendGrid info [MJ-382]
Several fixes [MJ-382]

- Add tests for expired messages
- Fix code retrieving messages
- Add comments
Merge pull request #746 from DirectEmployers/opt-out-bad-emails

Disable and opt out emails when we receive information saying the email is bad [MJ-382]