Maybe you can help me too.. I did all this:

n SSMS select Database Mail under Management, right-click and Configure Database Mail. After that's complete send a test mail using the new profile to confirm that works.

Next, open the properties of the SQL Server Agent. On the Alert System page enable the mail profile. Restart the SQL Server Agent for the change to take effect.

Under the SQL Server agent create Operators to send messages to.

Finally, in your job select Notifications and set the Operator to send to when the job completes.

but when I click on sql server agent properties to send a test mail, I can choose my operator but the send test tab is greyed out????