HI,
Create new registry string value key HKEY_LOCAL_MACHINE\SOFTWARE\Altiris\eXpress\SoftwarePortal
String Value name: 'NotificationsSender' Value data: desired email address
http://www.symantec.com/docs/TECH230435
This link for PF for 7.5 Sp1 HF5, also this fix included into 7.6 HF3, you not need to install this PF on 7.6 HF3, only create new registry string.
Regards,
Dmtiri