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Removing Database Mail History

The SQL Server MSDB database can grow very large due to extensive use of Database Mail and/or sending large attachments via Database Mail.

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SQL Server 2005, SQL Server 2008 R2, SQL Server 2012, SQL Server 2014

SQL Server stores all mails and attachments in the MSDB database. To avoid unnecessary growth of the MSDB database you should remove
the mail history unless it is required for auditing or other purposes.  If frequently sending large attachments using database mail this can cause the database
MSDB to grow rapidly.

*Warning: Irreparable database damage can occur. This procedure should only be performed by users familiar with SQL Server Management Studio. Databases should be backed up prior to performing this procedure.*

To display all mails processed by Database Mail, the sysmail_allitems view can be queried by executing one of the following statements.
FROM msdb.dbo.sysmail_allitems
FROM msdb.dbo.sysmail_allitems

There are 3 additional views available (sysmail_faileditems, sysmail_unsentitems andsysmail_sentitems) which contain the mails of different status respectively.
Also, all attachments are stored within the MSDB database.  These are contained in the sysmail_attachment table.

To delete mail items, use the system stored procedure sysmail_delete_mailitems_sp. 
The syntax is as follows:  
sysmail_delete_mailitems_sp [@sent_before] [@sent_status]

Mail can be deleted using either of the parameters.  The @sent_before parameter specifies a date which all mail sent prior to the
specified date will be deleted. The @sent_status specifies the status of the mails which will be deleted.
For example, to delete all mails which are sent and are older than current month we can use:
EXEC  msdb.dbo.sysmail_delete_mailitems_sp
      @sent_before = '2012-05-10 00:00:00',
      @sent_status = 'sent'

After executing the above stored procedure to delete the unrequired mail, querying the sysmail_event_log view verifies the deletions that have been initiated.
SELECT description
FROM sysmail_event_log
ORDER BY log_date required

** see attachment containing the SQL script text

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