2016 Postmortem
In reply to the discussion: UPDATE: Very Bad Development In Hillary's Email Investigation: She Knew It Was A Security Risk [View all]Aerows
(39,961 posts)is that you have much better success with them on having a lower scaled pipe in, with corresponding fibre channel/10+10+10 arrays and then a fast pipe out.
The biggest problem I have found is that the journaling/process/transaction makes it easy if you can just pump it out in the front, and let the back have a delay to do your archiving/journaling/transactions cost.
Nobody gripes once they get an email - they do gripe about not getting it at all. That's what they do gripe about - is when all of them get clogged in the pipe and you have an MTA so full you are backed up and your server is clogged.
Slower pipe in, fast multiple array, guaranteed delivery and fast pipe tends to lead to happier customers.
And that is the antithesis of ever single server other than a DB server.
But a mail server is a DB server, so the confusion is expected.