# ESP (Email Service Provider) Questera AI offers robust integrations with various email service providers, enabling seamless data ingestion for enhanced marketing insights. By extracting historical email data, Questera AI t empowers marketers to perform detailed segmentation based on send, open, and click aggregates. This allows you to target specific audiences, such as users who have never opened an email, those who have never clicked, or those who have received more than 10 messages. Additionally, Questera AI tracks email unsubscribe status and ESP list membership, helping you segment users and analyze unsubscribe rates effectively. While capabilities vary depending on the provider, Questera AI ensures comprehensive support for optimizing your email marketing strategies through precise data-driven insights. Explore our integrations for more detailed information on the specific functionalities available with each provider. --- # 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.questera.ai/questera-ai-platform/data/connect-data-and-models/data-sources/esp-email-service-provider.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.