Fix Outlook Not Sending or Receiving Emails – Step-by-Step Guide (2025)

Facing issues with Outlook not sending or receiving emails? You're not alone. Many Office 365 and Outlook users report delays or complete email sync failures caused by configuration or server-side issues. This guide will walk you through practical fixes that resolve 90% of common Outlook email problems.

1. Check Internet and Server Connection

First, ensure your internet connection is stable and Outlook servers are up. Visit Microsoft Service Status to verify Outlook and Exchange availability.

2. Verify Email Account Settings

Incorrect server details are the #1 cause of Outlook send/receive errors. Open Outlook and go to:

File → Account Settings → Server Settings
Ensure IMAP or POP3 ports are configured correctly (IMAP: 993 / POP3: 995 / SMTP: 587)
Use SSL/TLS encryption for secure connections

3. Disable Add-ins Temporarily

Sometimes third-party add-ins cause email transmission errors. Restart Outlook in Safe Mode by pressing Windows + R and typing outlook /safe. If emails work here, disable problematic add-ins under File → Options → Add-ins.

4. Repair Outlook Data File (.OST / .PST)

Corrupted data files are another common reason for email sync failures. Run Microsoft’s Inbox Repair Tool:

Close Outlook completely
Search and open SCANPST.EXE
Browse and select your data file (.pst or .ost)
Click “Start” to scan and repair

5. Rebuild Outlook Profile

If all else fails, rebuild your Outlook profile. Go to Control Panel → Mail → Profiles → Add and reconfigure your account using updated settings from your email provider.

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Fix Outlook Errors Fast – Your Step-by-Step Guide (2025)