Sigsync Company wide email Signature tool is the perfect solution for adding signature to all your mails.  It includes many advanced features.

You can create professional Email signatures very easily
You  can automatically configure with Office 365 server.
Provides variety of professional email signature templates
You set rules and different templates to different users.
Provide high security as it is certified with Information Security Management Standards ISO 27001:2013 and also OAuth 2.0 secured authentication.
You can  upload and configure profile images and personal details,  logos, product banners, social media icons, etc
It perfectly adds the signatures to all your mails and also to reply and forwarded emails