Email sent from GP goes to Outlook but does not appear to have been sent.

Greetings to the well of knowledge...

I have just finished setting up an email environment for GP so that reports can be sent to users in our domain.  The function appears to be working successfully but when I look in Outlook's (2007) Sent Items folder, the messages show "This message has not been sent".  I'm baffled.

Thanks,

Ken