If the original recipient forwards an e-mail they receive, and then someone replies to that e-mail, can the original sender see this reply or the forwarded message?
We want people to be able to e-mail themselves the documents they've worked on, so they enter their sender e-mail address and their receiving e-mail address (usually the same address) and then our system sends it via our SendGrid IP. The emails are being blocked. What are some ideas?