<Task instance name and path>: Failed to send post session failure e-mail for this session instance.
You selected the On Failure Email option for the session, but the Integration Service failed to send the post-session email. This might occur if you did not specify an email profile on the machine hosting the Integration Service, or if the machine does not have an email client.
Verify you specify an email profile on the machine hosting the Integration Service, and that the machine has the correct email client.