Raise Error from SSIS pkg

Question

Can I raise an error form SSIS package component execute sql task and have the control re-direct to some other say mailing component and to send an email on certain condition 
e.g.
I have a below code in expression of Execute SQL Task which on status<>0 sets the variable @exit_pkg = 'True' and RaiseError as below and control is passed to a alternate component defined with precedence logic as on
FAILURE and @exit_pkg = 'True' 
IF @STATUS = 0
BEGIN
SELECT 'FALSE' AS Exit_Pkg
UPDATE [Config1] SET [IN_USE] = 1
END
ELSE
BEGIN
SELECT 'TRUE' AS Exit_Pkg
--RAISERROR (15600,-1,-1,N' attempt was made to run the pkg in use');
END
Neil

Answer 1

I am setting the values of the variables using below code with Result Set mapping in execute sql task
SELECT 'FALSE' AS Exit_Pkg SELECT 'TRUE' AS Exit_Pkg
Neil