## Documentation Index

Access the complete documentation index at:
https://www.zoho.com/ca/books/kb/llms.txt

Use this file to discover all available documentation pages before proceeding.

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# I’m trying to send invoices from Zoho Books, but they had bounced back due to a bad mailbox. What should I do?

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*   [Open in ChatGPT (opens in new tab)](https://chatgpt.com/?prompt=Analyze+the+content+of+https%3A%2F%2Fwww.zoho.com%2Fca%2Fbooks%2Fkb%2Fgeneral%2Fbad-mailbox-error.html+and+understand+it+thoroughly+so+I+can+ask+questions+about+it.)
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*    [![View as Markdown](/books/images/ue-resources/llm-utility-menu/md.svg) View as Markdown (opens in new tab)](/ca/books/kb/general/bad-mailbox-error.md)

A bad mailbox error occurs when the recipient’s email address is incorrect or when their email server is blocking the email. To resolve this, contact the recipient. Once the necessary actions are taken, you can resend the email from Zoho Books.

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