Enable Automatic Updates for Sandbox

To ensure automatic updates are applied to your Sandbox environments after each Salesforce release, email notifications must be enabled.

Setup Instructions

Navigation Path: In Salesforce Setup, enter Deliverability in the Quick Find box, then select Deliverability.

This setting applies to both Production and Sandbox environments.

Under the Access to Send Email (All Email Services) section, choose one of the following:

Access Level	Description
No access	Only allows password reset emails. All other outbound emails are blocked.
System email only	Sends only system-generated emails (e.g., new user notifications, password resets). Useful for sandboxes to avoid sending test emails to real users.
All email	Allows all types of outbound emails. This is the default for new orgs that aren't sandboxes.

Note: If the access level dropdown is not editable, Salesforce has restricted changes for your org.

If email deliverability is not enabled, sandbox environments will not receive automatic updates after new releases.

When installing packages in a sandbox, replace the standard login URL with the test environment version:

❌ Do not use:

https://login.salesforce.com/packaging/installPackage.apexp?p0=04t2p000000l2cj

✅ Use instead:

http://test.salesforce.com/packaging/installPackage.apexp?p0=04t2p000000l2cj