Database Mail Configuration

EXECUTE msdb.dbo.sysmail_help_status_sp;

Use MSDB

EXEC sysmail_start_sp

Use MSDB

Select count(*) from ExternalMailQueue

sp_configure

http://blogs.msdn.com/b/sqlserverfaq/archive/2010/03/18/database-mail-failing-with-the-service-queue-externalmailqueue-is-currently-disabled-message.aspx