An email bounce occurs when an email is not delivered or is rejected by the recipient's email provider. There are two types of bounces:
Hard bounce: Occurs when an email address does not exist.
Soft bounce: A temporary failure, which can occur for reasons such as the recipient's server being down or the mailbox being full.
Too many bounced emails can harm your domain reputation, leading to your emails being marked as spam. This is why it is important to mark hard-bounced emails as invalid.
You can mark emails as invalid if they bounce by adjusting the settings within the Sub-Account Settings.
