Licensing Messaging Gateway - Small Business Edition

Hi All,

I had some queries regarding licensing enforcements regarding Symantec Messaging Gateway - Small Business Edition only. The availbility of this solution is either for 100 users or 250 users. My questions are below:

1 - Assume the customer is licensed for 100 users, How would the solution react if the number of email addresses increase to 105 or 110?

2 - Since there is no per seat licensing SMG - SBE would it be okay to provide 100 pack license or should we upgrade the license to 250? 

3 - In any case of the above (2), will the licenses be added on the same SMG - SBE server or would the customer need to create another SMG - SBE server?

4 - What is the maximum number of users a single SMG - SBE server can handle?

Thank you in advance.