Outlook
A family of Microsoft email and calendar products.
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thats error is showing when i send email to another email address
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Delivery has failed to these recipients or groups:
andrew566174f94a@gmail.com This message couldn't be delivered because the sending email address was not recognized as a valid sender. The most common reason for this error is that the email address is, or was, suspected of sending spam. Contact the organization's email admin for help and give them this error message.
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