How do I temporarily disable sp_send_dbmail? I have just taken over responsibility for a SQL 2000 system which made heavy use of xp_sendmail.  

We are in the process of upgrading to SQL Server 2008 R2 and I have implemented sp_send_dbmail.  

We are currently performing user acceptance testing on the new SQL Server.  The application sends out many emails directly to our customers.  Since our test database is a copy of our live database, there are many valid customer email addresses in our test database.  Is there a way to either temporarily redirect the emails or shut down the Database Mail service, without impacting our testing?
USE msdb
GO
EXECUTE dbo.sysmail_stop_sp
GO


Will stop the server from sending mail.  EXECUTE dbo.sysmail_start_sp  will start up the service again.