I think SpamFirewall licensing have to be per domain base,

Because all products like SpamFirewall are licensed per domain base.

User base licensing ok for mailserver use,but it's not suit for SpamFirewall use.

Also you can add JunkFilter to community edition,clustering and support should be in enterprise.

User-based licensing for the SMTP Proxy Firewall doesn't seem like a good idea to me.  As employees leave the company and their email account is deleted, how does Xeams know to remove that user from it's user count? I am getting the sense that the details of this decision were not carefully thought through.  

User-based licensing for the SMTP Proxy Firewall doesn't seem like a good idea to me.  As employees leave the company and their email account is deleted, how does Xeams know to remove that user from it's user count? I am getting the sense that the details of this decision were not carefully thought through.  

Of course charge Anti-Spam for users is not a good idea.

A lot of companys offer anti-spam gateway charge by domain for US$5.00 month, like spamhero. And you dont have to manage a server to host xeams.

JunkFilter per user it's crazy. My company use xeams only for spam filter - with this new price model we signup for spamexperts account that cost 1/10 of Xeams.

The per user system seems quite steep. I have about 47 users filtered by Xeams so it'll cost me about $41 per month. Or I could use something like Spam Hero for $5 per month and not have to use VM host resources for the xeams server. It seems obvious which solution is best.