when exim is the MTA it can not be false to have a backup / 2nd MX, not
only when the primary is down. when one of your user spam and the
primary is black listed for example. but that is only one reason to send
the outoing mail thow the 2'nd mx.
The MDA can be ha-cluster. but in my opinion HA is more "asking for
thruble" then it can help. auto switch does not always what is should.
(split brain)
Am 12.05.20 um 20:22 schrieb Evgeniy Berdnikov via Exim-users:
On Tue, May 12, 2020 at 12:53:27PM -0500, Linda Pagillo via Exim-users wrote:
My question is this... As a matter of best practices, if my primary,
in-house mail server which is hosting 500 domains/10,000 users was offline
for 24+ hours, would a backup MX not make sense in this scenario? Or if
this is not the best solution, what is the alternative? Thanks.
It's not a technical question, it's just a business topic. If your users
can wait 24+ hours, it has sense. Otherwise you have better to build up
some kind of HA-cluster. It may be space-separated (one node in your home,
other one in your friend's home). How it can be done is another question,
competely a technical one, but not for exim's mail list.
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