How I can fix as I am not receiving emails from out of my domine.

If you are not receiving emails from outside your domain in Outlook, there are several steps you can take to troubleshoot the issue:

1. Check Spam/Junk Folder: Sometimes, emails from external senders may be filtered into your spam or junk folder. Make sure to check those folders.
2. Verify Email Configuration: Ensure that your email configuration is correct. If your organization uses Microsoft 365, check with your email administrator to confirm that the settings are properly configured to allow external emails.
3. Network Configuration: Make sure your network allows connections from the IP addresses used in Microsoft 365 datacenters. If there are restrictions on your network, this could prevent external emails from being received.
4. Throttled Traffic: If you receive a Non-Delivery Report (NDR) indicating that access is denied, it may be due to throttling from Microsoft 365 because of suspicious activity from your IP address. In this case, the restriction will be evaluated and may be lifted after a short period.
5. Contact IT Support: If the issue persists, it may be beneficial to contact your IT support team or email administrator for further assistance. They can check the mail flow and any potential issues that may be affecting email delivery from external sources.

By following these steps, you should be able to identify and resolve the issue with not receiving emails from outside your domain.

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References:

• Find and fix email delivery issues as a Microsoft 365 for business admin
• Microsoft 365 throttled traffic from my IP address

Dear @Fatima Waqas, 

Thank you for posting your question in the Microsoft Q&A forum.  

I see you tagged this as Outlook web. Does your subscription include the Outlook app? If it does, please help me check both New Outlook and Classic Outlook. See if those emails are being received on the app. 

Are you not receiving all external emails or only some of them? Do you receive some but not others? 

Are your colleagues experiencing the same issue of not receiving external emails as you are? 

Seemly you used your personal account to do a test, if so, did you receive any NDRs (Non-Delivery Reports) when you sent them? If yes, then please kindly share the screenshot with me, thank you. 

Do you have any error information or error codes? If so, please kindly share a full screenshot with me, thanks. 

• First, in Outlook web, please help me check Rules: Settings > Mail > Rules > Review all rules to ensure none are set to delete or move to a different folder any mail that comes from outside your organization. 
• Please help me open your Junk Email folder. Are any external emails located there? 
• In Settings > Mail > Junk email > check whether you have it set to Standard or Strict? Additionally, scroll down to Blocked senders and domains > see if any external mail is being blocked there? 

Please help me check these settings on your mail account, and also on your colleague's account if they are receiving emails, so we can compare them. If the settings are fine, and you and your colleague have the same settings, then in this case, you must reach out to your organization's Global Admin (usually the company's IT Admin) and ask them to check the following steps below: 

• Microsoft has settings in Exchange admin center which could prevent external users to send you an email. Please go to Admin centers> Exchange> Recipients> Mailboxes, select and open your mailbox> Mailbox features> Message delivery restrictions> Require that all senders are authenticated. If you want to receive messages from external senders, this option should be unchecked. Also check Accept messages from/ Block messages from fields. 
• Then, in Exchange admin center, help me check Mail flow > Rules. 
• Second, it is recommended that please check the MX record for your office 365 account (Domain).   

If you are not the admin of your office 365 organization, please ask your admin to help check it. 

Please kindly believe that I will do my best to do more research and testing to help you further when I get the feedback I need. 

Looking forward to your response! 

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It sounds like your Outlook account is receiving internal emails (from colleagues in your domain) but no external emails. This almost always indicates an issue on the mail server or domain level, not Outlook itself.

Below are the most common causes and how to troubleshoot each one.

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Start With the Most Likely Causes

1. Mailbox or domain has anti-spam filtering blocking external emails

External emails may be quarantined, blocked, or flagged as spam before reaching Outlook.

What to do

Check your Spam/Junk Email folder.

Check Quarantine if your organization uses:

Microsoft 365 Defender

  Proofpoint
  
     SpamTitan
     
        Mimecast
        
        Ask your IT admin to check:
        
           *Exchange Admin Center → Mail flow → Message trace* (search for external sender emails)
           

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2. Your domain’s MX records changed or DNS is misconfigured

If your domain’s MX records were modified recently, external emails will fail to deliver but internal ones still work.

What to do

Ask IT to verify in DNS:

MX records correctly point to your mail provider (Microsoft 365, Google Workspace, cPanel, etc.)

No expired DNS entries

No misconfigured SPF record preventing external inbound mail

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3. Transport rule blocking external emails

An email flow rule in Exchange could unintentionally block or redirect external mail.

What to check

Admin should look at:

Exchange Admin Center → Mail Flow → Rules Look for:

Rules applying to “outside the organization”

  Rules redirecting or deleting emails
  

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4. Inbox rules in Outlook or server-side rules

Your Outlook or server rules could be moving/deleting external mail.

Check in Outlook

Outlook → File → Manage Rules & Alerts

Also check using Outlook Web (OWA) – server rules show up here.

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5. External senders receiving bounce messages?

Ask an outside person to send you an email and check if they receive a bounce-back error like:

“Mailbox full”

“Message blocked”

“Address not found”

“SPF/DKIM/DMARC failure”

“550 5.7.1 Access denied”

If so, the bounce details will tell exactly what is wrong.

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6. Mailbox full / quota exceeded

Even on Office 365, quotas can be enforced.

Check:

Outlook → Folder → View Quota Or OWA → Settings → General → StorageIt sounds like your Outlook account is receiving internal emails (from colleagues in your domain) but no external emails.

This almost always indicates an issue on the mail server or domain level, not Outlook itself.

Below are the most common causes and how to troubleshoot each one.

---

Start With the Most Likely Causes

1. Mailbox or domain has anti-spam filtering blocking external emails

External emails may be quarantined, blocked, or flagged as spam before reaching Outlook.

What to do

Check your Spam/Junk Email folder.

Check Quarantine if your organization uses:

Microsoft 365 Defender

  Proofpoint
  
     SpamTitan
     
        Mimecast
        
        Ask your IT admin to check:
        
           *Exchange Admin Center → Mail flow → Message trace*  
            (search for external sender emails)
           

---

2. Your domain’s MX records changed or DNS is misconfigured

If your domain’s MX records were modified recently, external emails will fail to deliver but internal ones still work.

What to do

Ask IT to verify in DNS:

MX records correctly point to your mail provider (Microsoft 365, Google Workspace, cPanel, etc.)

No expired DNS entries

No misconfigured SPF record preventing external inbound mail

---

3. Transport rule blocking external emails

An email flow rule in Exchange could unintentionally block or redirect external mail.

What to check

Admin should look at:

Exchange Admin Center → Mail Flow → Rules
Look for:

Rules applying to “outside the organization”

  Rules redirecting or deleting emails
  

---

4. Inbox rules in Outlook or server-side rules

Your Outlook or server rules could be moving/deleting external mail.

Check in Outlook

Outlook → File → Manage Rules & Alerts

Also check using Outlook Web (OWA) – server rules show up here.

---

5. External senders receiving bounce messages?

Ask an outside person to send you an email and check if they receive a bounce-back error like:

“Mailbox full”

“Message blocked”

“Address not found”

“SPF/DKIM/DMARC failure”

“550 5.7.1 Access denied”

If so, the bounce details will tell exactly what is wrong.

---

6. Mailbox full / quota exceeded

Even on Office 365, quotas can be enforced. Check:

Outlook → Folder → View Quota
Or OWA → Settings → General → Storage

7. Forwarding or forwarding loop blocking mail

Check if someone accidentally enabled:

Email forwarding

Rules forwarding external mail away

A loop that causes messages to be dropped

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Quick Checklist for You

Please try the following and tell me what you find:

Did the Junk or Quarantine folder contain anything?

Did an external sender receive a bounce-back error?

Has your IT recently changed:

Domain hosting

  DNS records
  
     Email provider
     
     Does Outlook Web (OWA) also fail to receive external emails?
     
     Do you have any Inbox rules showing?