Microsoft Outlook Won't Send Messages

By Bennett Gavrish

If your email service provider uses the POP3, IMAP or Exchange protocol, you can set up your email account in the Microsoft Outlook application. As long as you have an active Internet connection, you should be able to both send and receive email messages in Outlook. If you are having trouble with only outgoing mail, however, you can troubleshoot the issue in a variety of ways.

Things You'll Need

  • PC running Windows XP or later
  • Microsoft Outlook 2003 or later

Step 1

Disable all Outlook add-ins. Sometimes certain third-party extensions that you have installed in Outlook can prevent outgoing messages from being sent. To disable them, go to the "Tools" menu and select "Options." Then go to the "Other" tab and click "Advanced Options." Press the "Add-In Manager" button and uncheck all of the boxes to disable all add-ins.

Step 2

Check your configuration settings by going to the "Tools" menu and selecting "Email Accounts." Specifically, check your user name, password and outgoing server address and port.

Step 3

Set a default email account. Go back to the "Tools" menu and select "Email Accounts" again. In the list of accounts, highlight the one you want to use to send mail and press the "Set as Default" button.

Step 4

Disable all third-party anti-virus and firewall software. Sometimes these programs are specially designed to control email messaging, and they may be preventing mail from being sent in Outlook.

Step 5

Close Outlook and restart your computer. Many times, a simple reboot will resolve sending issues in Outlook.