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How to solve '550 sender verify failed' error message'?

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When you try to send an e-mail message, you may receive the following SMTP error message:
550 Sender verify failed.

This error message occurs when the sender e-mail account does not exist in cPanel, or when the domain's MX entry records are misconfigured in cPanel.

For example, suppose when you add a parked domain, an addon domain, or even an entire cPanel account (if you are a reseller) and If your domain's MX records (as set at the domain registrar) point to an external e-mail provider, you must also configure the MX entries in cPanel to use the external e-mail provider. Additionally, in cPanel you must create the e-mail accounts that you want to use to send messages.

*Make sure the e-mail account you are using to send messages actually exists in cPanel, and that you are using the correct username and password for SMTP authentication.
     1 Log in to cPanel.
     2 Email accounts >> Manage      

*If the domain uses a remote e-mail provider, make sure the MX entries are set correctly in cPanel:
     1 Log in to cPanel.
     2 Under Zone editor >> select domain >>manage >>Email Routing configuration
     3 select "RemoteMail Exchanger"


*If the domain uses a local e-mail provider, make sure the routing has set to "Local Mail Exchanger"

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