A soft bounce in email marketing occurs when an email reaches the recipient's mail server but is unable to be delivered to their inbox due to a temporary issue. Common reasons for soft bounces include a full inbox, service issues, large email size, and spam filters.
Unlike hard bounces, which indicate a permanent delivery issue, soft bounces can often be resolved by retrying the delivery at a later time. However, it's important to monitor soft bounce rates and take steps to reduce them, as frequent soft bounces can negatively impact your sender reputation.