Microsoft Outlook & ATT Secure Mail Key - Microsoft Community
https://answers.microsoft.com/en-us/outlook_com/forum/all/microsoft-outlook-att-secure-mail-key/2b3bc167-b180-45fc-9706-49aa5ad29d77
Mar 04, 2020 · Select Create secure mail key. Select Copy secure mail key to clipboard. (Jot down your secure mail key, so you have it handy if you have to update an email app on several devices.) For security purposes, the secure mail key only shows until you select OK. If you lose or forget the secure mail key, you can create new secure mail keys as needed.
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