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Fix Outlook Not Sending Emails (2026 Guide) – Easy & Proven Solutions

Learn how to fix Microsoft Outlook not sending emails with 10 proven solutions. Step-by-step guide to troubleshoot Outlook email issues بسرعة and restore sending instantly.

TROUBLESHOOTING & FIXES

Abdur Rahman

3/26/20263 min read

Fix Outlook Not Sending Emails (2026 Guide)

Email communication is essential for both personal and business use. So when Microsoft Outlook stops sending emails, it can quickly become frustrating and disruptive.

If you're facing the “Outlook not sending emails” issue, don’t worry — this guide will walk you through simple, effective, and professional solutions to get your emails flowing again.

Common Reasons Why Outlook Won’t Send Emails

Before jumping into fixes, it's important to understand the possible causes:

Poor or no internet connection
Incorrect SMTP settings
Large attachments blocking emails
Emails stuck in the Outbox
Antivirus or firewall interference
Corrupted Outlook profile or data file
Outdated Outlook application

10 Proven Ways to Fix Outlook Not Sending Emails

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1. Check Your Internet Connection

A weak or unstable connection is the most common cause.

👉 Make sure:

Your Wi-Fi or mobile data is working
Try opening a website to confirm connectivity
Restart your router if needed

2. Check the Outbox Folder

Sometimes emails get stuck and prevent others from sending.

👉 What to do:

Open Outlook → Go to Outbox
Delete or resend stuck emails
Remove large attachments if necessary

3. Verify SMTP Server Settings

Incorrect outgoing server settings can block emails.

👉 Check:

SMTP server address
Port number (usually 587 or 465)
Encryption method (TLS/SSL)
Username & password

👉 Tip: Contact your email provider if unsure.

4. Remove Large Attachments

Big files can stop email delivery.

👉 Solution:

Keep attachments under 20–25 MB
Use cloud services like Google Drive or Dropbox to share files

5. Restart Outlook

Sometimes, a simple restart fixes temporary glitches.

👉 Steps:

Close Outlook completely
Reopen and try sending again

6. Disable Antivirus or Firewall Temporarily

Security software may block outgoing emails.

👉 Try:

Temporarily disable antivirus
Check email sending
Re-enable after testing

⚠️ Important: Only disable temporarily for testing.

7. Repair Outlook Data File

Corrupted files can cause sending issues.

👉 Use Inbox Repair Tool (ScanPST):

Locate ScanPST.exe
Scan your Outlook data file (.pst)
Repair errors

8. Recreate Outlook Profile

A damaged profile can prevent email sending.

👉 Steps:

Go to Control Panel → Mail
Click “Show Profiles”
Create a new profile
Set it as default

9. Update Outlook

Outdated software can cause bugs and errors.

👉 Update via:

File → Office Account → Update Options

Keeping Microsoft Outlook updated ensures better performance and security.

10. Disable Add-ins

Some add-ins interfere with email sending.

👉 Fix:

Open Outlook in Safe Mode
Disable unnecessary add-ins
Restart Outlook

Bonus Tips to Prevent Future Issues

Regularly clean your mailbox
Avoid sending very large attachments
Keep your system and Outlook updated
Use genuine licensed software (avoid cracked versions)
Backup your emails periodically

When Should You Contact Support?

If none of the above solutions work:

👉 You should:

Contact your email service provider
Reach out to Microsoft support
Check if your account is blocked or restricted

Final Thoughts

Email issues can be stressful, especially when you rely on them for business communication. Thankfully, most “Outlook not sending emails” problems are easy to fix with the right approach.

By following the steps above, you can quickly troubleshoot and restore your email functionality — ensuring smooth communication without interruptions.