By default, Outlook does not automatically save copies of unsent e-mail messages that are encrypted. You can enable this setting so that Outlook autosaves unsent encrypted e-mail messages to the user's Drafts folder.
Registry Hive | HKEY_CURRENT_USER |
Registry Path | software\policies\microsoft\office\16.0\common\mailsettings |
Value Name | allowautosavecryptomail |
Value Type | REG_DWORD |
Enabled Value | 1 |
Disabled Value | 0 |