This may lead to more error reports than we want to see. A not existing
email address may cause Bugsnag to be notified. If this happens, we can
rescue form these specific errors and only report the rest.
The most common failure would happen when sending the confirmation email
triggered by `user.save`. We rescue any errors here and give feedback to
the user.
This allows for immediate feedback when the user types an email address
that is not accepted by our mail server or the email setup is not
configured properly.
