Le 19/07/2023 à 22:08, Gerald Galster a écrit :
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.) High availability currently is cheap with a small two server setup: You need 3 servers or virtual machines: dovecot (and maybe postfix) running on two of them and mysql galera on all three. This provides very affordable active/active geo-redundancy.
No offence, it's just a pity to see that feature disappering.
Could not say more : all my past setups were like this. With postgres or openldap instead of mysql. It was a feature I waited for years and heavy used for last ten years. Big complicated shared storage was NEVER needed or suitable alone in all my encountered scenario. And in case of active/active Geo, even with shared storage, the geo replication was entrusted to dovecot and not to the underlying storage for efficiency and consistency purpose.
Emmanuel.