Comment by nine_k
1 day ago
In short: 30k users, 40k mailboxes, 100M emails and calendar entries migrated. The client is Thunderbird. The server / web side is handled by Open-Xchange, hosted by a local provider with the same name (AFAICT), which also offers commercial licensing for the otherwise-AGPL suite.
The service gets operated by Dataport AöR. Dataport is the primary service provider / datacenter of some german federal states and owned by them.
They client is mainly Open-Xchange AppSuite Web UI, some people use Thunderbird on top. There are also thousands of mobile devices, syncing via IMAP, SMTP, CalDAV, CardDAV.
Open-Xchange is most likely a more effective name for the combination Cyrus IMAP, postfix, etc.
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.
The mail server is Dovecot Pro, with some high-scalability improvements.
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So besides it being dovecot instead of cyrus, I am right?
Btw, cyrus and postfix are far from random.
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