It is a multi-step process to set up alarms on events.
Before setting up alarms, it is worthwhile to check that the proper events generated.
DFM supports a number of snapmirror related events, including
SnapMirror Update: Failed
SnapMirror Nearly Out of Date
SnapMirror Out of Date
To check if DFM has previously generated these events, log in to the WebUI.
Go to ControlCenter->DisasterRecovery->Events. This will show if the events have
been generated. Based on what you've described, you should see a SnapMirror Update; Failed
event for the relationship where the source was grown.
The other part of the equation is to set up alarms for the events you are interested in.
This is done from ControlCenter->Setup->Alarms. On this page you select the events
and the user to recieve the alarm.
The setup process includes a test button to test that the alarm can be delivered to the recipients.
It is a good idea to use the test button.
If the test does not result in an email getting delivered to the recipients then the underlying mail service
may not be working correctly or the email address could have a typo.
This is for release 3.5 and newer.
Hope this helps.
-Marlon