Error: ‎550 5.7.1 : Recipient address rejected: User email address is marked as invalid‎; what will be the solution of my problem?

Thank you for providing the screenshot, Shine_453. This error might be due to a policy restriction either by your organization or the recipient organization if it is outside. You may contact your IT administrator or your organization for further discussion regarding the policy that might be restricting. If there's none, you may need to contact the recipient's IT administrator via other means (phone, in person, etc.) and ask them to inform their email admin about your email delivery problem. Their email admin might need to reconfigure the recipient's mailbox to accept emails from you.

For more information, you may check the link below:

https://learn.microsoft.com/exchange/troubleshoot/email-delivery/ndr/fix-error-code-550-5-7-1-in-exchange-online

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it is a corporate acct. ill attached a screen shot for the error code

Hi Shine_453

Thank you for reaching out. My name is Leo, a user just like you. I'd be happy to help you with your concern.

May I know where you saw the error code? What changes were made that might be causing the issue? Are you using a personal or corporate account? It would be very helpful if you could provide more information or a screenshot of the issue for us to better understand it. We'll wait for your response to assist you further. If the issue persists, please don't hesitate to let us know. We, the community users, are always here to help. Thank you!

Your understanding and patience will be highly appreciated. Let me know if you have any further questions. Be safe always!

Best Regards,

Leo