Bluehost blocks all external SMTP ports. Your site will not be able to connect to Zoho.
Your options are:
- Use a Bluehost email with the local Bluehost email server.
- Or use Gmail with the Gmail API with Postman SMTP.
- Or use Mandrill with the Mandrill API with wpMandrill
- Or use SendGrid with the SendGrid API with the Sendgrid plugin