Hi @Cathy Ramsey
Thank you for posting on Microsoft Q&A forum.
It appears you’re experiencing issues with incoming emails despite having sufficient storage.
Please review the following steps to migrate the issue:
1/ Check Outlook and account settings
Make sure you’re using the correct version of Outlook and that your profile isn’t corrupted.
If Outlook can’t connect properly, repair your profile:
- Choose File > Account Settings > Account Settings
- Select your account > Repair

To learn more, please visit: Fix your Outlook email connection by repairing your profile - Microsoft Support
2/ Verify junk email and rules
Check junk email settings:
- Open Outlook then go to the Home tab.
- In the Delete group, select Block → Junk Email Options.

- From here, you can:
- Adjust the protection level (No Automatic Filtering, Low, High, Safe Lists Only).
- Manage Safe Senders, Safe Recipients, and Blocked Senders lists.
Check rules settings:
- In Outlook, select File > Select Manage Rules & Alerts.
- You can create, edit, or delete rules that move, delete, or flag messages based on conditions.
Additional details are available at the link below: I can't send or receive messages in Outlook - Microsoft Support
3/ Check forwarding and filters
- Go to File > Select Manage Rules & Alerts.

- In the Email Rules tab > Click New Rule.
- Under Start from a blank rule, select Apply rule on messages I receive > Choose Next.

- Do not select any conditions if you want this to apply to all messages > Click Next, then confirm with Yes.

- Under Select actions > Choose: forward it to people or public group (or redirect it to people or public group).
- Click the link in Step 2 to specify the forwarding address.
- Finish and apply the rule.

You may find further guidance here: Microsoft Guide: Turn on automatic forwarding in Outlook.
4/ Confirm mailbox and cloud storage
5/ Run a message trace (Admin only)
If you have Microsoft 365 admin access:
- Go to Exchange Admin Center > Navigate to Mail Flow > Choose Message Trace.
- This shows if the email was delivered, rejected, deferred, or lost.
Here’s a resource that provides more insight: Message Trace Guide
6/ Check DNS and MX records
If you use a custom domain:
7/ Use Microsoft troubleshooters
You can try go to automated tools for Outlook and Microsoft 365 issues at here: Issues sending and receiving email.
I hope this information is helpful. Please follow these steps and let me know if it works for you. If not, we can work together to resolve this.
Thank you for your patience and your understanding. If you have any questions or need further assistance, please feel free to share them in the comments on this post so I can continue to support you.
I look forward to your thoughts on this.
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