A message that is returned to the server that sent it. Bounced emails are either a permanent failure to deliver the email or a temporary failure to deliver the email, based on conditions with the recipient mail server.
Hard Bounces – A hard bounce is an e-mail message that has been returned to the sender because the recipient’s address is invalid. A hard bounce might occur because the domain name doesn’t exist or because the recipient is unknown. If a email is on the bounce list, we will auto drop any future requests to this email address.
Soft Bounces – A soft bounce is an e-mail message that gets as far as the recipient’s mail server but is bounced back undelivered before it gets to the intended recipient. A soft bounce might occur because the recipient’s inbox is full.