avast! for Linux/Unix Servers License doubt

Hello,
I would like to use Avast on a mail dedicated server, however I have
some doubt about the method used by avast to calculate the number of licenses.

Consider the following scenario:

  1. One Linux mail server with some local user mailboxes. In this case I have my users configured on the local machine. Here I have many administrator users (e.g. root, bin, adm, mail, news, etc…). My doubt is: these users are calculated by the Avast server?

  2. The email aliases (/etc/aliases) should be considered as mailboxes?

  3. Is there a method to know the number of licenses used by the Avast Antivirus while it is running?

Thank you very much for your support.

This should be sent directly to Avast Sales rather than here.

I already sent this question to sales@avast.com but they didn’t give me a satisfactory reply (they given me even wrong answers about a question regarding a scenario with a mail relay).

They didn’t explained me how Avast really calculates the number of mailboxes used.
If I can’t understand this, how can I correctly estimate the number of licenses to buy?

P.S.
I sent the same question to support@avast.com but I haven’t got any reply.

Man, that’s not very good service! Those would be the two sources to get an official answer. Very strange. This forum is basically peer-to-peer support. Bloody hound them with emails until you get an answer is all I can suggest.