How do I turn on SMIME?

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Select a different account.

You have multiple accounts

Choose the account you want to sign in with.

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S/MIME settings are specific to accounts. The setting screen is where S/MIME is enabled.

By toggling S/MIME to ON, this enables the feature, and allows the sign, encrypt, and sign + encrypt options to show up in the compose window. Without this feature enabled, S/MIME will not function.

To turn s/mime on:

Go to the specific account, and tap on the account.
Under the security option, there will be an option to switch s/mime on/off
If this option (security) is not on, .pfx files will not be able to be installed.

Important: Turning on S/MIME will turn off threaded conversations across the app. If users want to resume threaded conversations, S/MIME must be turned off.

Shows the process of SMIME being turned on. First there's a Settings screen with a couple accounts, then an account screen with a Security section. The third screen shows the SMIME setting, with a toggle, and the last screen shows a warning about threaded conversations being turned off.