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Sending, receiving, and organizing email in Outlook.com
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I've had two different people reach out today to tell me they have recieved 'undeliverable' errors after trying to email me today. Yesterday there was no issue and I have not made any changes to settings on my end. Images of errors they received below. Is the error on my end or theirs, and how do we fix this?
Sending, receiving, and organizing email in Outlook.com