Imports
- github.com/chrj/smtpd
- github.com/google/uuid
- github.com/prometheus/client_golang/prometheus
- github.com/prometheus/client_golang/prometheus/promhttp
- github.com/prometheus/common/version
- github.com/sirupsen/logrus
- github.com/vharitonsky/iniflags
- golang.org/x/crypto/bcrypt