This guide explains how to manage errors of type Soft Bounce & Hard Bounce that can occur when sending emails, particularly when using the Newsletter Infomaniak.

Hard Bounce

A hard bounce is an email that cannot be delivered for permanent reasons.

• email sent to a fake address
• domain of the recipient's email which is not a real domain
• recipient's server that does not accept emails
• etc.

Example of the Infomaniak Newsletter tool after a send with 20% Hard Bounce:

Soft Bounce

A soft bounce is an error message indicating that the email has not been delivered to its recipient and corresponds to a presumably temporary routing problem: the email address is valid, and the sender can resend the email.

Several reasons can explain a soft bounce and therefore why the recipient's server temporarily rejects the email:

• the recipient's inbox is full: due to insufficient storage capacity, the recipient no longer receives messages
• an issue occurs with the recipient's mail server: the server is temporarily unavailable or down, or the user has inadvertently set filters that prevent the reception of certain messages
• when the content of the e-mail, including its attachments, is too large, the delivery issue occurs at the time of sending

Unless the recipient has permanently abandoned their inbox without deleting their account, a soft bounce is a temporary issue.