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The test system diverts all emails to accounts you nominate. This way you can see exactly what the customer would see if the email had gone to them from the live system.
Suppressing Informational Messages
If you do not want to see informational messages - example "Confirmation this record has been saved" type messages (Note that you will still see Warning messages and Error messages).
you can - set your login default to "Off"
You can toggle on any screen to off or on.