What is bounce in email?

A bounce in email means that the email sent didn’t reach the recipient.

The sender gets a notification informing that the recipient’s email address isn’t receiving the email and displays an error message indicating the reason of the bounce.

Most of the time, email bounce is caused by an email address that doesn’t exist anymore, isn’t valid, a inbox that is full, or an email server refusing to accept the incoming email.

Bounced emails are emails that haven’t arrived at their destinations, normally because the recipient has a problem with their email address or because the email address can no longer be reached. They are emails which have been rejected by email servers for the above reasons.