How to Fix Outlook 2016 Not Sending Mails?

How to Fix Outlook 2016 Not Sending Mails?
How to Fix Outlook 2016 Not Sending Mails?

Outlook 2016 is a popular email client used by millions worldwide. However, it’s not uncommon for users to encounter issues with sending emails. In this article, we’ll explore common causes and effective solutions to fix Outlook 2016 when it fails to send emails.

Common Causes of Outlook 2016 Not Sending Mails:

  • Email Server Issues: Sometimes, the problem lies with the email server rather than Outlook itself. Server downtime or maintenance can disrupt email sending capabilities.
  • Incorrect Email Settings: Incorrectly configured email settings, such as server addresses, ports, or authentication methods, can prevent Outlook from sending emails.
  • Antivirus or Firewall Interference: Overzealous antivirus or firewall settings may block Outlook’s connection to the email server, resulting in failed email delivery.

Troubleshooting Steps:

  • Check Internet Connection: Ensure that your device is connected to the internet and try sending emails again.
  • Verify Email Settings: Double-check your email account settings in Outlook, including incoming and outgoing server details, SSL settings, and authentication methods.
  • Temporarily Disable Antivirus/Firewall: Temporarily disable antivirus or firewall software and attempt to send emails. If successful, adjust the settings to allow Outlook access.
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Advanced Troubleshooting:

  • Repair Outlook Profile: Use the built-in repair tool in Outlook to fix any issues with the user profile that may be causing sending problems.
  • Update Outlook Software: Ensure that Outlook is up to date with the latest patches and updates from Microsoft, as newer versions may contain bug fixes related to email sending.
  • Check for Corrupted Outlook Data Files: Scan and repair corrupted Outlook data files (PST or OST) using the Inbox Repair Tool (ScanPST.exe) provided by Microsoft.

Additional Tips and Tricks:

  • Clear Outbox: If emails are stuck in the Outbox, try clearing it out and resending the emails.
  • Send Test Emails: Send test emails to yourself or another account to check if the issue persists.
  • Contact Email Service Provider: If all else fails, reach out to your email service provider for assistance in resolving the sending issues.


Encountering issues with sending emails in Outlook 2016 can be frustrating, but with the right troubleshooting steps and techniques, most problems can be resolved efficiently. By following the tips outlined in this article, users can regain control over their email communication and ensure smooth sending experiences.


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