If you havent followed proper procedures when moving and restoring databases you might run into a problem with database mail like:
SQL Server Error: 14650, Service Broker message delivery is not enabled in this database. Use the ALTER DATABASE statement to enable Service Broker message delivery.
First stop the agent service.
Run the following:
ALTER DATABASE MSDB SET NEW_BROKER
Start the agent service…
Tape umbilical cord to belly button for fun, you saved the day!