It sounds like from that example that you could do that with For or Foreach Loop container to loop through your emails and do the appropriate operations instead of maybe...
I agree with the earlier post saying this is MUCH more easily done with a Send Mail task and expressions. You're doing nothing but replicating functionality already built into...
I usually do and haven't encountered any hiccups. For my backups, I have a full backup kick off every night, differentials every six hours, and log backups every hour....