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How to send and receive mail over multiple connections?

MX record:
myCorp.com    MX preference = 10, mail exchanger =

I have two public IPs.
My firewall map to my internal mail server:

Issue#1: if wan1 is down, I can not receive external email;
Issue#2: if wan1 is down, I cannot send mail to external through wan2 either because some mail server do reverse DNS check and reject my mail server if it connects through wan2.

If I add a new MX recod as follows:
myCorp.com    MX preference = 10, mail exchanger =
on my firewall, I also map to my existing mail server

My goal is just to be able to send and receive mails through either or both of wan1 and wan2.

Q#1. If wan1 ( is down, will external mail servers automatically try to send it to vice versa?

Q#2. If wan1 is down, can my mail server send it through wan2 without being rejected? vice versa?

Q#3. If wan1 is preferred over wan2 when both are available, can I set the preference for wan1 lower than for wan2?


1 Solution
Q1. Yes
Q2. Yes, should work.
Q3 Yes
richtreeAuthor Commented:
Thank you.
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