There is a single license for the server software. Former users of MAILbus Monitor, which used LMF licensing, should be aware that the licenses for Mail Monitor are all PC-style licenses (even on DIGITAL UNIX and OpenVMS systems).
You need separate licenses for the following scanning modules/groups of scanning module:
These licenses all apply to scanning modules on a single server: product- specific licenses apply to one scanning module on one server, and the MAILbus (joint) license applies to scanning modules that will run on a single server.
All other scanning modules (Control, DNS, ISM, and PING) are freely licensed with the server license. There is no license for the client software.