Try executing these queries:
SELECT *
FROM sysmail_mailitems
GO
GO
SELECT *
FROM sysmail_log
GO
SELECT *
FROM sysmail_sentitems
SELECT *
FROM sysmail_allitems
SELECT *
FROM sysmail_event_log
For better, quicker answers on T-SQL questions, click on the following...
http://www.sqlservercentral.com/articles/Best+Practices/61537/
For better answers on performance questions, click on the following...
http://www.sqlservercentral.com/articles/SQLServerCentral/66909/