# Invoice email bounced API Reference

Delivered once per invoice email that ends up undelivered: the recipient's server rejected it
(`BOUNCED`) or the recipient marked it as spam (`COMPLAINED`). It is not sent again if the
same notification is received twice or the email had already been marked as bounced.

**Trigger:** The email sending service reports a bounce or a spam complaint for the email of an invoice.

**Recommended actions:**
- Flag the invoice in your records as not delivered and contact the customer by another channel.
- Fix the recipient address before sending the invoice again.

**Always verify `BeeL-Signature` before processing.**


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Full OpenAPI spec: https://docs.beel.es/api/openapi