I don't have any Python or Zope knowledge, and don't want to dive into them since I like it to be simple.
So I appreciate MailManager on Windows, so easy to install/use.
But is it possible to use it easily in a multi-enterprise environment? At the moment I have :
could it be that on the same machine I have
each of them with their own logo?
In the Zope ZMI just add another Mailmanager site to the root and call it <companyx>. You can add multiple sites. You can also have several email accounts on the one site - e.g. email@example.com and firstname.lastname@example.org
Although I have not changed the logo, I would imagine that is also possible to set per site.