Can't Turn Off NAV Outgoing E-mail Scanning

I am using Outlook Express 6 with Norton Internet Security 2005. I have Outlook Express configured to automatically hang up after sending mail, which causes Norton Antivirus to say that the message could not be sent because the connection was terminated.

I told Norton Antivirus to not scan incoming or outgoing mail by unchecking those options. But it would still scan outgoing mail and give that error. I went into Internet Security options and turned of the options to turn off the tray icon and progress indicator when scanning e-mail. But it still scans e-mail and gives the error message.

In addition to getting the error message, the e-mails are actually not sent, so it's more than just an annoying message.

How can I get Norton Antivirus (v. 11.5) to stop scanning outgoing e-mail??

Thanks!