Back in 2012, the founders of HelloFax started HelloSign, an electronic signature service that keeps track of all of the documents that you sign.
Recently, HelloSign has integrated with Gmail, making it easier than ever to electronically sign faxes and send them right back. HelloSign for Gmail is a plugin that lets you add your electronic signature to a document without ever leaving Gmail’s interface. When a document is attached to an email, the plugin gives you the option to “Sign”, right next to the options to “View” and “Download”. This opens a separate window side of Gmail that will allow you to add your electronic signature to the document. It also allows you to edit the document as needed. After signing the document, you just need to hit “Save and attach to email” and you’re ready to send the document back.