While composing a mail, show a status bar to enable/disable encryption

Hi,

we are currently developing an Outlook addon for email encryption.

Within the Thunderbird version of the addon we added a status bar just over the email content to enable / disable encryption, and also have the possibility to manage the identities of the recipients via a popup.

When the user decides to "Send" the email and encryption is enabled, our addon should encrypt and send the email.

Currently, I can only realize it within Outlook by adding a button that encrypts and sends the email via the Graph API. However, the compose mail window is still focused and it looks like the email is not send (thus, currently, the addon removes all data entered).