Domain Center Questions Best practices for MX Guarddog setup. What is the Domain Center? Can I view the contents of quarantined messages? How many email addresses can I have in exchange for a text link? My website is not in English, is that OK? Can the link be placed on any website? What is a quarantine shadow account? How can I cancel the service? Can messages be delivered on non standard ports? MX Guarddog IP Address List. How do I get technical support?