mailer: {
    from: process.env.MAILER_FROM || 'xyz@gmail.com',
    options: {
        service: process.env.MAILER_SERVICE_PROVIDER || 'Gmail',
        auth: {
            user: process.env.MAILER_EMAIL_ID || 'xyz@gmail.com',
            pass: process.env.MAILER_PASSWORD || 'aaaaaa'
        }
    }
}