Error message 503 although all settings are correct.

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I am setting up my email in Windows 10 and Outlook 16.
I can send email but I am receiving the error message 503 that email could not be sent to one or more recipients.
All my settings are correct. I even marked the root folder: INBOX.
Please help. Thank you.
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johnpaulb-imhs1
Hello sbirving, Thank you for your question regarding a 503 error on returned email. Here is a link to a similar question we answered about 503 Error and rejected email. If your problems persist, I recommend reviewing your mail logs for additional clues or record of transmission Thank you, John-Paul