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.
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