I can't send emails on Outlook. They all come back with "Your message wasn't delivered because the recipient's email provider rejected it."

If you're receiving a message stating that your emails were rejected by the recipient's email provider, it could be due to several reasons. Here are some steps you can take to troubleshoot the issue:

1. Verify the Recipient's Email Address: Ensure that the email address you are trying to send to is correct. A typo or outdated address can lead to delivery failures.
2. Check for Blocked Addresses: Sometimes, the recipient's email provider may block messages from certain addresses. If you suspect this might be the case, try sending an email to a different address to see if it goes through.
3. Review Email Content: Certain content in your email might trigger spam filters. Avoid using excessive links, attachments, or spammy language.
4. Contact Your Email Admin: If the issue persists, it may be beneficial to contact your email administrator or IT support for further assistance. They can provide insights into whether there are any issues with your account or server settings.
5. Check for Non-Delivery Reports (NDR): If you received a bounce message (NDR), review it for specific error codes or messages that can provide more context about the rejection.

If these steps do not resolve the issue, you may need to consult with your email service provider for more detailed troubleshooting.

References:

• Fix NDR error "550 5.1.10" in Exchange Online
• Fix NDR error "550 5.7.12" in Exchange Online

Hello John Hinestrosa,

Thank you for reaching out to Microsoft Q&A Forum. From your description, I understand your frustration, not being able to send emails when you need to work is completely disruptive.

I can see that an AI Assist has provided some troubleshooting steps above. Before we proceed further, could you kindly let me know: Have you tried any of the steps from the AI Assist response above? Specifically:

• Verifying the recipient's email address
• Check for Blocked Addresses
• Testing with a different recipient address

In the meantime, here are some additional steps that you could try:

1. Check your sending limits

Outlook.com has daily sending limits. If you've sent many emails today, you may have hit the threshold. Please see Sending limits in Outlook.com - Microsoft Support

2. Verify your account status

• Try signing in to https://outlook.live.com on a web browser
• Check if there's any warning banner about your account being temporarily restricted
• Sometimes Microsoft blocks sending if suspicious activity is detected

3. Contact Microsoft Support Team directly

• Sign in to Contact - Microsoft Support
• Type a brief description of your issue in the search box.    
• Click "Get Help" and press Enter, then scroll to the bottom and select "Contact Support”.    
• Look for and select "Chat with a support agent in your web browser" (during business hours) or a similar callback option (if available). Explain your situation clearly.
• Please note: The Chat support team only works at certain times, so if the last window says you are not available, try to open it again the next day. If you prefer phone support, you can leave a phone number. That way, they can contact you back and help you further.
• You can also see this step-by-step guide: Contact Support

For more details, please check this official article: Can't send or receive email in Outlook.com - Microsoft Support

Thank you for your understanding and patience. Feel free to let me know which steps you've already tried, and I can provide more targeted assistance.

Thank you for your understanding and patience. Please feel free to let me know how it goes.

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Good day John Hinestrosa, I hope you're well. May I know if you've got any chance to check my reply? If you have any further updates on this issue, please feel free to post back. I'm happy to help you.