Emailing an invoice from within Simply Accounting 2007

Question: I use Simply Accounting 2007 and MS Outlook 2003. Whenever I send an invoice to a customer by email from within Simply Accounting a dialog box appears saying, "A program is trying to access e-mail addresses you have stored in Outlook. Do you want to allow this?" I have to select YES in order to send the email. Then another dialog box comes up saying, "A program is trying to automatically send e-mail on your behalf. Do you want to allow this?" Again, I have to select YES. How can I stop these dialogs from appearing? Thanks for your help! Gregg.