I have a domain and I want that if one mx record fails then 2nd mx should takeover for sending and receiving mails.
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Yes, fallback MX is pretty standard. Run dig mx gmail.com and you'll see an example.
However, there is often no real need for it, because mail servers queue mail for a few days anyway, and there are extra problems you'll introduce having a fallback, one being that it's always hit harder by spammers, because its security it often less stringent.
Halfgaar
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