Session Failure emails
Here is a reusable email task you can use for the “On Failure E-Mail” property for any Informatica session. If the session fails an email is sent to an address you specify. The content of the email is generic but you get all relative information about the session’s failure, plus the session log as an email attachment.
Download the task and import it into a PowerCenter folder. Next set the “On Failure E-Mail” for a session to "reusable" and chose the email task.