Make sure the link between your sendmail and the preceding task is set to "Failure"

Found the answer...

When I deployed it to my test server, I enabled package configurations. When I brought it back into Dev and changed the UNC path for the...

Just tried pointing the daily package at the monthly file, and that worked fine. Its obviously something to do with the flat file reader, but even after deleting...

You could build an email task in the event handler for 'on error'. I did originally have seperate email tasks depending on which task failed, but found it...