Error occurs when you send or receive an email message in Outlook or Outlook Express – Microsoft Support

Warning This workaround may make a computer or a network more vulnerable to attack by malicious users or by malicious software such as viruses. We do not recommend this workaround but are providing this information so that you can implement this workaround at your own discretion. Use this workaround at your own risk.

Configure your firewall software to enable the following files to access the Internet:

• Outlook.exe (for Outlook)

• Msimn.exe (for Outlook Express)

By default, port 25 is for outgoing access, and port 110 is for incoming access. If you are not sure about the ports, contact your ISP or system administrator.

More information for McAfee Personal Firewall and Norton Personal Firewall (Symantec)

Go to the McAfee website for instructions on how to configure McAfee Personal Firewall.

Or, you can remove and reinstall McAfee Personal Firewall. This reinstallation process will make sure that Outlook and Outlook Express have Internet access, because the process re-creates the program signature file that is used by the firewall.

If you are running Norton Personal Firewall 2002, Norton Internet Security, or Norton SystemWorks software by Symantec, contact Symantec product support for upgrade or reconfiguration instructions to resolve your problem.