This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online.
The email signature template has been downloaded from:
www.mail-signatures.com/articles/signature-templates?sts=6651
For more advanced email signature features, check out CodeTwo Exchange Rules 2016:
https://www.codetwo.com/exchange-rules-2016?sts=6651