My generated document or eSign document is going to my spam folder in email account (gmail). What can I do to have this email come to normal inbox?

App Expert Reply:
Since emails are sent through Salesforce when using our app, the email deliverability is controlled by Salesforce.

Please refer to the this help article about setting up email deliverability and following best practices:
And this one:
In addition, you can take advantage of setting up an org wide email in your document action following this article so the email comes from a company domain to recipient: