Comment by cycomanic
Instead of guessing it's an easy lookup. OpenXchange is an app suite that's been around for >20 years. It's not some random ad hoc combination of software.
The email server underneath is dovecot btw.
Instead of guessing it's an easy lookup. OpenXchange is an app suite that's been around for >20 years. It's not some random ad hoc combination of software.
The email server underneath is dovecot btw.
There are no high scalability improvements, it is a regular Dovecot Pro setup.
44.000 mailboxes is not really big from Dovecot Pro point of view, there are dozens of other service provider customers running six to eight digit mailbox numbers on it. Biggest European installation serves 40M mailboxes although these are consumer / SMB mailboxes which lower load provide and size compared to Schleswig-Holstein.
I don't think so. Yes, there are open source components in there. But there's also a huge amount of their own code, and can iirc present as a whole MS Exchange server to an Outlook client. There's also a user-customizable web frontend with groupware-like features. The whole package is a lot different than just combining a few packages into a bare-bones email service.
The mail server is Dovecot Pro, with some high-scalability improvements.