A simple mailing service via HTTP. It receives messages from a POST payload and send email as requested, if the message is valid. The message must have the format like Message. To connect to the server, set HOST_SMTP environment variable. For now, it only accepts the gmail server (setted host and port to "smtp.gmail.com:465").

type message struct {
	To      string `json:"to"`
	Subject string `json:"subject"`
	Body    string `json:"body"`
	From    string `json:"from"`
	Token   string `json:"token"` // a temporary token!
}

• Add validator hooks for package mailer.