As long as you have published the labels to your users, they can select them from within Outlook when composing a message, and encrypt it on demand. You can also define a default label, to be applied on all new messages, if needed. Read for example here: https://learn.microsoft.com/en-us/microsoft-365/compliance/encryption-sensitivity-labels?view=o365-worldwide
Microsoft 365 Message Encryption (Azure Information Protection Premium P1)
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We have message encryption through Azure P1. There are several options in which situation the message is encrypted, for example, if it is sent to a certain address or if the message title contains a certain word.
Is it possible to turn on message encryption in Outlook in some other way?