This may help..

 

http://ts.mcafeehelp.com/?siteID=1

Do you get any error messages when you try to send?

 

See this:

http://windowshelp.microsoft.com/Windows/en-US/Help/7ba4b73a-33ee-4237-a994-9840892440761033.mspx

 

 

Also, if your version of McAfee has email scanning, disable it. It can cause problems like this. (Your email will still be scanned by McAfee when it is written to your hard drive- you are still protected).