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McAfee VirusScan Blocks SMTP Email Functionality

Primary Software: LabVIEW Development Systems>>Base Package
Primary Software Version: N/A
Primary Software Fixed Version: 8.0
Secondary Software: LabVIEW Development Systems>>Base Package, LabVIEW Development Systems>>Full Development System, LabVIEW Development Systems>>Professional Development System, Lookout

Problem: I am having difficult using the Lookout e-mail object or the LabVIEW SMTP Email VIs. I have the Windows XP firewall disabled and they still do not work. I have McAfee VirusScan installed. What is the problem?

Solution: McAfee VirusScan is also a firewall. Sending e-mail uses TCP/IP port 25. Since this port is commonly used by viruses to relay spam, McAfee will block it by default unless it is manually disabled. You can test this by temporarily disabling McAfee's On Demand virus scanner (Right click on the McAfee Shield, select Disable On Access Scan). VirusScan can be configured to allow outbound e-mails:

1. Open the VirusScan Console: Right Click the VirusScan shield in the system tray and select VirusScan Console...
2. Double-click the Access Protection item to open it.
3. Un-check the Prevent Mass Mailing Worms from Sending Mail rule.
4. Click OK and close the VirusScan Console.

You can now leave VirusScan enabled and send emails programmatically.

Related Links:
KnowledgeBase 307HDM59: Why Do I Get Errors With the SMTP Email VIs?
SMTP Communication Troubleshooting

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Report Date: 06/28/2006
Last Updated: 10/12/2006
Document ID: 3YRD02J8

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