Our outbound email provider credentials (ID, password) must be updated frequently. Using OOTB CDH / Platform outbound email activities where SMTP server information is in class Data-EmailAccount.

At present an administrator must manually log in to update the default.notify email account whenever credentials change. Outside of pega, the credential change triggers automation and the automation engine could call REST services.

Using best practices, we are trying to store email credentials to custom dynamic system settings, then reference the credentials using Global Resource Settings. 

POC testing suggests that Global Resource Settings are actually not recognized - debug logs show that references to Datapage.property in the email account record are passed to SMTP provider as "Datapage.property".

Are global Resource Settings supposed to be supported for sending email?

Primary application