This scope lets an app "View the workspace members' email addresses"
Your Slack app may gain access to email addresses belonging to team members in a workspace by asking for
users:read.email. This scope is now required to access the
This scope must be requested at the same time as
users:read.email OAuth scope is now required to access the
users.info web API methods.
users:read is no longer a sufficient scope for this data field. Learn more.
This OAuth permission scope works with these Web API methods.
users.lookupByEmail- Find a user with an email address.