Hi,
1/ Navigate to IMC > Alarms > All Alarms, open the alarm you wish to customize
2/ In the alarm details screen, take note (copy) of the Trap OID
3/ Navigate to IMC > Alarm > Trap Management > Trap Definition. At the top of the page you can see the "Search Trap Name" search box. Next to this, you can enable the Advanced search (using the >> arrows, but they point down).
4/ In the TRAP OID field, enter the previously copied OID and Search
5/ For the found Trap, use the Modify link to modify the trap
6/ The Description field here is what you will get in the Email content. Beware that this also modifies the description used in the IMC Alarm list.
Hope this helps,
best regards,Peter