Forward unknown email receipient to secondary mx

I would like to know if the secondary mx record will received the email which are unknown on my primary mx record or if the sender will received a 550 error by the primary email server.
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felicienfleuryAsked:
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MurfurFull Stack DeveloperCommented:
No. Secondary MX will only be contacted if the primary MX does not respond to the initial handshake

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Email Protocols

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