The idea is to add the following system information to all notifications emails, doesn't have to be prominent, but at least it enables you to differentiate them.
Subscription: xyz
Data center: lon09
Munchkin ID: 123-ABC-456
If you are admin for multiple instances it is currently a nightmare always having to guess where this or that error took place. Also, user invitations - people can not differentiate if they are activating sandbox or production (we're on SSO, so the login IDs are the same across systems).
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