# Email delivery ### Sending a loyalty card to clients via a personal link If you already have a customer database, you can easily invite them to install a loyalty card. Simply send a personalized email or SMS with a unique installation link. Before doing so, make sure to add customers to the system and issue their loyalty cards — this will generate individual installation links. More details here [How to create and send a mailing. Send sms and emails to your customers. ](https://docs.boomerangme.cards/mailings-and-other-services/how-to-create-and-send-a-mailing) --- # Agent Instructions: 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: ``` GET https://docs.boomerangme.cards/card-distribution/online/email-delivery.md?ask= ``` The question should be specific, self-contained, and written in natural language. 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.