On 07/19/2023 12:51 PM MDT Marc marc@f1-outsourcing.eu wrote:
A 50-100 mailbox user server will run Dovecot CE just fine. Pro would be overkill.
What is overkill? I always thought it had a bit more features and support.
For Pro 2.3, you need (at minimum) 7 Dovecot nodes + HA authentication + HA storage + (minimum) 3 Cassandra nodes if using object storage. This is per site; most of our customers require data center redundancy as well, so multiply as needed. And this is only email retrieval; this doesn't even begin to touch upon email transfer.
Email high availability isn't cheap. (I would argue that if you truly need this sort of carrier-grade HA for 50 users, it makes much more sense to use email as-a-service than trying to do it yourself these days. Unless you have very specific reasons and a ton of cash.)
michael