Imports
- github.com/spf13/viper
- github.com/emersion/go-msgauth/dkim
- github.com/rollbar/rollbar-go/errors
- github.com/rollbar/rollbar-go
- github.com/emersion/go-sasl
- github.com/emersion/go-smtp
- github.com/sirupsen/logrus
- github.com/emersion/go-smtp-proxy
- github.com/heroku/rollrus
- github.com/mholt/certmagic