Email bounces occur when messages are undeliverable, potentially losing marketing opportunities with clients.
Bounced emails return with a timestamp, server details, and an RFC code indicating the bounce reason.
Soft bounces are temporary issues like server downtime or full mailboxes, often resolving automatically.
Hard bounces are permanent problems, such as nonexistent addresses, requiring removal from your list.
Maintain a low bounce rate through good practices like double opt-in and regular list cleaning.