* Accept all 2xx status codes from mail clients
Signed-off-by: JacobSMoller <scherffenberg91@gmail.com>

* Updates test_send_notification_success to include an ACCEPTED status
Signed-off-by: JacobSMoller <scherffenberg91@gmail.com>

* Also check for all 2xx codes for feedback emails
Signed-off-by: JacobSMoller <scherffenberg91@gmail.com>