Create an account with Newoldstamp.

Start a free 7-day trial to get full access to the functionality available.
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Create multiple departments if you need different signatures for different groups of users.
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Create a master signature for every department.
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Set the integration with Office 365.
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Deploy Outlook add-in to the users in your organization by installing it through the Microsoft AppSource.
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Then, generate signatures by importing data from Active Directory. Or, you can use a CSV import option if your AD is unprepared.
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Deploy the signatures centrally or send them via email and enjoy the result ;)
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Additionally, you can also set up Banner Campaigns and track the Analitycs.
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