Why and how are we receiving notifications from our Portal Server regarding new Portal Integration software updates
Applies to 4.x SaaS and On-Prem (even though the email only specifies SaaS)
If you go into Policy Manager: Tasks > Global Settings > Manage Cluster Wide Properties
You will see a portal.bundle.version property and value. This property is being checked on by a Scheduled Task within policy to check the version and if it's outdated. You can confirm this by either searching "Bundle" in the policy window or by going to Tasks > Global Settings > Manage Scheduled Tasks.
The scheduled task policy pushes this check to Portal which is why the email comes from your Portal server. Simply update the bundle or ignore the email.