[calinutz]

I am not an english language native, and anyways license agreements usually are too complicated for me to understand, so please help me with this question:

I work for a company that wants to use this mail system. So JUST to use it. NOT to modify it, NOT to re-sell it or whatever other purpose.
JUST to use it.
Can we do this without cost? Or do we have to buy some licenses ?

Please do answer me simple . And in addition maybe give me some links about what should I try to read/print in order to be covered.

Thank you very much