communication

type EmailConfiguration struct {
	Username string
	Password string
	Host     string
	Port     int
}

type EmailMessage struct {
	// email sender is not necessarily the same account used in the email configuration, e.g.: no-reply account
	From    string
	To      []string
	Subject string
	Body    string
	// text/plain or text/html
	ContentType string
	// Additional headers out of "From", "To", "Subject"
	AdditionalHeaders map[string]string
}

type EmailSender interface {
	Send(emailMsg EmailMessage) error
}