smtp/config.go
func (se *SMTPEnvironment) GetEnvironment(environment string) interface{} {
	for env, conf := range se.Env {
		if strings.Compare(environment, env) == 0 {
			return conf
		}
	}
	return nil
}
func (se *SMTPEnvironment) GetEnvironment(environment string) interface{} {
	for env, conf := range se.Env {
		if strings.Compare(environment, env) == 0 {
			return conf
		}
	}
	return nil
}
//GetEnvironment returns a SMTP Server configuration for the specified environment in parameter