Configuring Database mail with SMTP authentication

I try to configure database mail on SQL Server 2005 (June CTP)
All the services are running under the same domain account which has been also added to corporate Exchange server. When creating a database mail account on SQL Server, I check the "SMTP server requires authentication" check box and enter the account name and paassword. When trying to apply the changes I get the following error:
"An error occured during decryption (Microsoft SQL Server, Error 15466)"

Is there any workaround on this error?

Thanks.
Artem

Check this thread:

http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=1905071&SiteID=17