> For the complete documentation index, see [llms.txt](https://docs.nosto.com/techdocs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nosto.com/techdocs/apis/rest/customers/blacklisting-customers-using-the-blacklist-api.md). # Blacklisting Customers This endpoint is used for blacklisting email addresses from receiving Nosto's triggered emails such as cart-abandonment emails, order-follow emails, and we-miss-you emails. Having the corresponding email address in our system prior to blacklisting or unblacklisting is not a prerequisite. If the specified email record does not exist in our system, it will be created. ## Token This endpoint requires an Email token. ## Blacklisting an email You can specify multiple email addresses separated by a newline. ``` curl -v -X POST https://api.nosto.com/v1/email/blacklist?op=add \ --user :WI0j2oN7TgG42tlblX3yzOQ5xvCYc2oYj9eWg79lghVq8R0nKQXlVE9wvihBUFOw -d ' john.doe@nosto.com jane.doe@nosto.com' ``` ## Unblacklisting an email You can specify multiple email addresses separated by a newline. ``` curl -v -X POST https://api.nosto.com/v1/email?op=remove \ --user :WI0j2oN7TgG42tlblX3yzOQ5xvCYc2oYj9eWg79lghVq8R0nKQXlVE9wvihBUFOw -d ' john.doe@nosto.com jane.doe@nosto.com' ``` --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.nosto.com/techdocs/apis/rest/customers/blacklisting-customers-using-the-blacklist-api.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.