There are various reasons as to why an email may hard bounce. The most common reason is that the domain name does not exist or the recipient is unknown.  This may be due to misspellings in your address list, to recipients changing email providers, or to businesses closing.

Addresses that hard bounce may be considered bounced-out addresses and emails will not be sent to them again. This is based on the value set under Delivery Management within the iPost application.

Soft bounces typically indicate a temporary delivery issue, such as the recipient’s inbox is full or the receiving email server is down.

Soft bounces are handled differently than hard bounces. When a soft bounce occurs, the system will attempt to send the same email again over a 2-4 day period. If that email continues to soft bounce consistently, it will be counted as one hard bounce after that period.

A block bounce occurs when the email server rejects the email due to filter issues. These issues could include URL blocks, a lack of proper authentication, or blacklisting.

Block bounces are reported as hard bounces in your delivery statistics but are not counted toward your hard bounce settings. Subscribers will not bounce-out of the iPost application due to a blocked bounce.