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

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• Outdated Outlook application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.