func convertConfig(config booking_mail_config.Config) (mailer.Config, error) {
	result := mailer_config.New()

	host, err := config.SmtpHost()
	if err != nil {
		return nil, err
	}
	result.SetSmtpHost(host)

	password, err := config.SmtpPassword()
	if err != nil {
		return nil, err
	}
	result.SetSmtpPassword(password)

	port, err := config.SmtpPort()
	if err != nil {
		return nil, err
	}
	result.SetSmtpPort(port)

	user, err := config.SmtpUser()
	if err != nil {
		return nil, err
	}
	result.SetSmtpUser(user)

	return result, nil
}