I seem to be having an issue with certain employees not creating an e-mail signatures within Outlook or the Office 365 portal. I've been researching and it seems the only option I can find is creating a disclaimer on the exchange server. But this would apply the disclaimer to all messages which I'm trying to avoid. I only want to add a signature or disclaimer if the message is missing the e-mail signature. The rules within the exchange server don't seem to have any entries that relate to signature checking. Any suggestions?
Environment: Exchange Server 2013 / Office 365 Hybrid configuration.