CodeTwo Email Signatures On-prem is the only email signature management tool that works with Exchange Server Subscription Edition and is installed locally. Based on technology developed and refined since 2007, it’s the new incarnation of CodeTwo Exchange Rules Pro and CodeTwo Email Signatures 365: award-winning, Microsoft-certified email signature and email flow management tools. This easy-to-use Exchange toolbox helps you create complex rules to centrally manage email flow and to unify the look of your corporate correspondence – all without touching end users' computers and mobile devices. With everything installed locally on your Exchange Server, you don’t need any additional cloud services to use the solution and maintain full control over your data.