What table holds the email address for the OOTB notifications such as Timesheet Notification?
Release : 15.6.1
Component : CA PPM SAAS STUDIO
The table which is used for the email address and other user information is CMN_SEC_USERS
SRM_RESOURCES also hold the email address.
Through the UI or XOG, if one is changed, the other automatically updates so they stay in sync.
However the OOTB notifications do use information on CMN_SEC_USERS table.