According to HubSpot Academy, this is the scope of the material for the Email Certification:
The certification is suitable for designers with experience in crafting website pages, templates, and styles. Basic proficiency in writing HTML and CSS are required for completion. This two-part certification will test your proficiency with using HubSpot tools to design.
You can see a copy of my HubSpot Academy Inbound Certificate by clicking on the badge below or clicking here. My certification is valid until October 2017.