A soft bounce refers to an email message that is temporarily undeliverable to the recipient’s inbox due to a temporary issue, such as a full mailbox or a server error. Unlike a hard bounce, which is a permanent delivery failure, a soft bounce is a temporary setback that can be resolved and the email can eventually be delivered successfully. This type of bounce is often caused by technical issues or a recipient’s email server being down. Soft bounces are typically reattempted for delivery, making them a less severe issue than hard bounces.