There may be benefits to allowing an emoji or two in your company email signature in specific situations. If your business benefits from giving a more laid back impression or are in the gaming industry, then an emoji can help.
Clickable emojis can work well with customer support teams and marketing staff. Using a clickable emoji such as a happy or sad face, you can route your recipients to a survey or feedback form to give their opinion of your products and services.
Emojis for the company, departments or individuals?
It's up to you - You got 100% flexibility!
Whether or not you should allow emojis in email signatures can be a company-wide decision or something that each team leader could determine depending on the department's function and target audience.
Example > How to add the email emoji?
Insert emoji in the email signature template: