Hi Timo,
as @Mohammad already wrote: There is the 5 user free license.
However: Please know, that there are quite a few culprits, if you want to actually set up and use a mail server from home.
Depending on where you are living, there are a few things you might want to keep in mind:
- ISPs blocking SMTP ports
- Blacklists blocking “Dynamic” IP Ranges, ie. ranges of IP addresses used by ISPs to assign to their customers (Rather common in Germany and the Netherlands, for instance)
So if you want to give Axigen a test spin or use it for home or family: you might want to see if a VM at a hosting company might be a solution:
Hetzner, DomainFactory (JiffyBox), Rackspace, Amazon, Azure etc. etc. etc.
For ~ 5 EUR / Month you can get a decent VM, fixed IP address and a standard Linux OS and you’d avoid all those culprits.
Cheers and good luck!