How to Fix Outlook Not Receiving Emails

When Outlook stops receiving emails, it can be caused by issues on the client side (your Outlook app), the server side (mail server configuration), or somewhere in between (DNS, firewalls, filters). This guide covers all scenarios systematically.

Whether you're using Outlook desktop, Outlook on the web, or the mobile app, the troubleshooting steps below will help you identify and fix the problem.

Quick Fix Checklist

• ✅ Check your internet connection and Outlook status bar
• ✅ Look in the Junk/Spam folder — emails may be filtered
• ✅ Verify IMAP/POP3 server settings are correct
• ✅ Check if mailbox is full (storage quota)
• ✅ Disable mail rules that may be redirecting emails
• ✅ Verify MX records point to the correct server
• ✅ Test by sending from a different email account

Common Causes

1. Incorrect Server Settings

Wrong IMAP/POP3 settings are the #1 cause of receiving issues:

# Correct settings for most hosting providers:

# IMAP (Recommended):
Server: mail.yourdomain.com
Port: 993
Encryption: SSL/TLS
Username: [email protected]

# POP3:
Server: mail.yourdomain.com
Port: 995
Encryption: SSL/TLS
Username: [email protected]

2. Emails Going to Junk Folder

Outlook's built-in junk filter may be catching legitimate emails:

• Check Junk Email folder in Outlook
• Right-click misclassified email → Not Junk
• Add sender to Safe Senders list: Home → Junk → Safe Senders

3. Mailbox Full

If your mailbox quota is exceeded, new emails will bounce:

# Check quota in cPanel:
# Email Accounts > Manage > Check Usage

# Increase quota or clean old emails
# Delete large attachments and empty Trash folder

4. Mail Rules Redirecting Emails

Outlook rules may be moving, deleting, or forwarding emails automatically:

• Go to File → Manage Rules & Alerts
• Review all active rules
• Disable suspicious rules one by one to test

Step-by-Step Fix

Step 1: Test Email Flow

Send a test email from a different provider (Gmail, Yahoo) to your Outlook address. If it arrives, the issue is sender-specific. If it doesn't, the issue is on your side.

Step 2: Check Webmail

Login to webmail directly (e.g., https://yourdomain.com:2096). If emails appear in webmail but not Outlook, the issue is with your Outlook client settings.

Step 3: Verify IMAP Settings in Outlook

1. Open Outlook → File → Account Settings
2. Select your account → Change
3. Verify incoming server: mail.yourdomain.com
4. Port: 993 (IMAP SSL) or 143 (IMAP STARTTLS)
5. Username: full email address
6. Click Test Account Settings

Step 4: Check Server-Side MX Records

# Verify MX records point to your mail server
dig MX yourdomain.com +short

# Expected output:
# 0 mail.yourdomain.com
# OR
# 0 yourdomain.com

# If MX points to wrong server, update DNS

Step 5: Check Server Mail Logs

# Check if emails are arriving at the server (Exim)
grep "[email protected]" /var/log/exim_mainlog | tail -20

# Check for delivery confirmation
grep "Completed" /var/log/exim_mainlog | tail -10

# Check for rejections
grep "rejected" /var/log/exim_mainlog | tail -10

Step 6: Rebuild Outlook Profile

If Outlook client is corrupted:

1. Close Outlook completely
2. Go to Control Panel → Mail → Profiles
3. Click Add to create a new profile
4. Re-enter your account settings
5. Set the new profile as default

Microsoft 365 / Outlook.com Specific Fixes

• Check Focused Inbox — emails may be in the "Other" tab
• Review Block & Allow settings at outlook.live.com → Settings
• Check Microsoft 365 Exchange rules in Admin Center
• Verify your subscription is active and mailbox isn't disabled

Common Mistakes

• Using POP3 on multiple devices: POP3 downloads and removes emails from server — use IMAP for multi-device access
• Wrong port numbers: IMAP is 993 (SSL) or 143 (STARTTLS), POP3 is 995 (SSL) or 110 (STARTTLS)
• Cached credentials: If you changed your password, Outlook may use the old one. Remove saved credentials from Windows Credential Manager
• Firewall blocking: Corporate firewalls or antivirus may block ports 993/995
• Full mailbox: When quota is exceeded, the server silently drops new emails

Frequently Asked Questions

Why does Outlook say "Connected" but I'm not receiving emails?

Outlook may show "Connected" for the SMTP (sending) server while the IMAP (receiving) connection is broken. Check the status bar at the bottom — it should show "All folders are up to date." Also check Junk folder and mail rules.

Should I use IMAP or POP3?

Use IMAP in almost all cases. IMAP syncs emails across all devices and keeps them on the server. POP3 downloads and typically deletes from the server, so you can only access emails on one device.

How do I fix "Cannot connect to server" error in Outlook?

Verify server hostname, port, and encryption settings. Try mail.yourdomain.com with port 993 (IMAP SSL). If that fails, test connectivity: telnet mail.yourdomain.com 993. Ensure your firewall/antivirus isn't blocking the connection.

Emails work in webmail but not Outlook — why?

This confirms the server is working correctly. The issue is in your Outlook client settings. Re-verify server hostname, port, encryption, and credentials. Try removing and re-adding the account in Outlook.