On 01/04/2023 08:04, Peter via Postfix-users wrote:
On 1/04/23 00:36, Corey Hickman via Postfix-users wrote:
Since almost every sending MTA has the queues, do I need a secondary
MX for my domain email?
Secondary, or backup MXes are almost never recommended in the modern
internet and tend to be a relic of the 1990s dialup internet. What is
often times done for very high traffic situations is load balancing,
which can be implemented similar to a secondary MX (but having the
same MX priority for two or more servers instead of different
priorities).
Secondary MX entries can also be used for a type of spam trap since
spammers will often times try to abuse them and send directly to the
secondary MX instead of trying the primary first as they should do,
see "MAIL EXCHANGER POLICY TESTS" in postscreen(8) for an
implementation of this.
None of this is what you are considering. If you still want to
implement a secondary MX then it must have all of the same anti-spam
measures as the primary server, be just as well maintained, and
requires a lot of work to get right, all of this for a server which
will likely see little or no legitimate email traffic. My opinion is
you are better served spending your time and efforts on the primary
server.
That's all right. Thanks.
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