A soft bounce occurs when an email isn’t delivered because there is a temporary problem with the receiving email address, such as an inbox being full or an email attachment being too large. Soft bounces are an important metric to track, because along with the hard bounce metric, it shows you how many of the emails you send are being delivered. This can provide valuable insight on the overall health of your email lists.
To calculate your soft bounce percentage, divide the number of emails that soft bounced by the total number of emails sent.
Learn: What is Email Bounce Rate?
When a soft bounce occurs, an email provider will continue to try to deliver the message for a few days. If you notice a pattern of soft bounces occurring with specific email addresses, it is best to remove those addresses from your email list because internet service providers (ISPs) use bounce rates as a key determiner when establishing an email sender’s reputation.