An email bounce signifies non-delivery of your email message and can happen for a number of different reasons. When an email bounces, we will mark that contact with the tag BOUNCE and you will see that the email bounced on the timeline history:
A soft bounce is when your recipient's email address is valid but the message never reached the recipient's mail server because of a reason such as:
- The server was down
- The message was too large for the recipient’s inbox
- The recipient's inbox was full
A hard bounce occurs when your email is permanently rejected because the email address does not exist or is invalid.