Have you ever tried to send an email as an attachment in Gmail? You'll notice it's being saved as an EML format. But what exactly are the pros and cons of EML, and how do they stack up with PDF? 
PDF or EML: Which format reigns supreme for email storage? Unveil the clear winner inside. https://blog.cloudhq.net/pdf-vs-eml-which-format-should-you-use-for-emails/

PDF vs. EML- Which Format Should You Use for Emails?

Read

cloudHQ covers all of your email productivity needs. With over 60 email apps, and more than 10M clients, we've mastered helping you save time by helping you work more efficiently and get more things done in a day than you ever thought you could. https://blog.cloudhq.net
cloudHQ. Helping your productivity, 1 click at a time.