Regarding the HA cluster setup for email services, both Cyrus IMAPd and Dovecot support master-slave replication.

If you're setting up a cluster in HA, you'll need to store your emails in an object storage. Dovecot Pro includes this feature. Cyrus IMAPd has some support for object storage too, but I haven't tested it personally.

On 6/14/24 11:13, Jeff Peng via Postfix-users wrote:
Hello,

Is there any guide to setup a distributed email system? there should be multiple MX, multiple IMAP/storage servers, and sasl server cluster etc.

Thanks.
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