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Resolve Soft Bounce / Hard Bounce errors
This guide explains how to manage Soft Bounce and Hard Bounce errors that can occur in email delivery, especially when using Infomaniak Newsletter.
Hard Bounce
A hard bounce is an email that cannot be delivered for permanent reasons.
- Email sent to a non-existent address
- Recipient's email domain is not a real domain
- Recipient's server does not accept emails
- And so on.
Soft Bounce
A soft bounce is an error message indicating that the email is not delivered to the recipient and corresponds to a temporary routing problem: the email address is valid, and the sender can retry the delivery.
Several reasons can explain a soft bounce, indicating that the recipient's server temporarily refuses the email:
- The recipient's inbox is full: due to insufficient storage capacity, the recipient no longer receives messages
- A problem occurs at the recipient's email server: the server is temporarily unavailable or down, or the user has unintentionally set up filters that prevent the reception of certain messages
- When the email content, especially its attachments, is too large, the routing problem 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.