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Sending, receiving, and organizing email in Outlook.com
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Sending, receiving, and organizing email in Outlook.com
Hi! Sorry to hear about this situation. Since you received an undeliverable email notification, could you please share a screenshot of the full error message? That notice usually includes the specific reason the message was flagged as spam.
In many cases, this can be related to a file attachment, the message formatting, or even a signature inserted as an image. It would also be helpful to confirm whether this happens when sending to all recipients or only to one specific server or domain.