Get Organized. DC Shoes' email footer is split into three, clearly labeled buckets of content so it's easy to scan and select (bonus: the design is responsive and the three columns become one on mobile). Find more on email footer design here http://emaildesign.beefree.io/2016/01/best-practices-email-footer-design/
HubSpot's footer is a great example of how HTML background colors can be used to distinguish the footer from the rest of an email. Find more on email footer design here http://emaildesign.beefree.io/2016/01/best-practices-email-footer-design/
A hierarchy provides direction and clarity. Medium does a great job of structuring actions by order of importance in their footer. Find more on email footer design here http://emaildesign.beefree.io/2016/01/best-practices-email-footer-design/
ESignatures is a collection of 20 Email PSD signatures suitable for you or your company’s email footer. These signatures can be used for any kind of business like E-commerce, Retail, or Corporate. ESignatures has simple yet professional design. These templates will help you to get that perfect design regarding your email signatures.