My company would like to build backup mail gateway. Do I need another license for this?

The rule is:

If the server will be active (turned on and used as a mail server etc...) then you will need an SNF license for that server.

If the server will be inactive (turned off, and/or no email passes through it) such as a "cold" or "warm" spare then you do not need an additional license for this server --- you will be required to move your existing license to the new server and remove it from your old server if/when the new server becomes active.

If you will have both servers active at the same time for any period then you will need to purchase license instances for each.

The exception to this is when you transition from one server to another. In that case, you may use one SNF license on both servers, for a short, reasonable time as required. A "reasonable" transition time is considered to be in the range from a few hours to a few (2-3) days.

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