You may get the message shown below when updating signatures for Microsoft Outlook on macOS Mojave. This is Mojave's stricter security policy that is preventing Xink from setting the Outlook signatures.
You need to press "OK" to allow Xink to set the signatures for your MS Outlook.
If you later wish to revoke the permissions given to Xink, go to System Preferences on your Mac and click "Security & Privacy". Then choose "Automation" and clear the checkbox next to "Microsoft Outlook" shown below "Xink.
