I ended up running the job in two steps, step one runs sp_spaceused on the 12 tables I check and sends the result to a file. Step 2 sends the results file to me (see below).
EXEC xp_sendmail 'e-mail address', @subject = 'space used results', @attachments = 'E:\Program Files\Microsoft SQL Server\MSSQL$SIDESHOW\results.txt'
Thanks,
Manny