Automating EMail with Access + OutlookXP

I am tryng to automate sending large numbers of email using Outlook XP from an Access database. The problem is that Outlook security asks user for a confirmation on each email and the “Yes” button is on the dialogue box is not enabled for 5 secs

I am using the sendkeys command to respond and I need to know how to delay the response until the box can accept a yes. Thanks