####Preventing Emails From Getting Blocked by GMail, Yahoo etc. NOTE: In order to send email via PostMark or Sendgrid, you need to verify sender's email(from address). In PostMark you can do that by setting your company or other private email(e.g. firstname.lastname@example.org) and verifying that. Then you can use THAT company or private email(e.g. email@example.com) in the FROM address. #Running Locally You need two terminal windows open, one for client and the other for server.