Chris St. Pierre wrote:
We've put /var/lib/imap and /var/spool/imap on a SAN and have two
machines -- one active, and one hot backup.  If the active server
fails, the other mounts the storage and takes over.  This is not yet

Also consider /var/spool/{mqueue,clientmqueue,postfix}.

Depending on how your server fails, there could be important incoming mail stuck in those queues, and silently failing over to a server without them could be bad.
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