Email notifications being "bounced and could not be delivered"
Starting yesterday, I have not been receiving email notifications that documents have been sent for signature or signed by those outside our company.
When checking document progress, it shows a document has been signed by someone outside our company, but the activity section shows "Email sent to [name] [email] bounced and could not be delivered."

Any ideas why this is happening? and what is the solution? I've seen posts about this, but no solution has been posted. Thank you.
