# Manage mailing options - [How to configure SMTP](https://docs.b2core.b2broker.com/how-to-articles/manage-mailing-options/how-to-configure-smtp.md): Learn how to configure SMTP in B2CORE to send client email notifications. Set up SMTP details like hostname, port, username, and password, then test and enable the connection for reliable mailing - [How to determine why clients fail to receive email notifications](https://docs.b2core.b2broker.com/how-to-articles/manage-mailing-options/how-to-determine-why-clients-fail-to-receive-email-notifications.md): Learn how to identify why clients don’t receive email notifications by checking email logs, verifying template activation, testing email service, and reviewing SMTP server settings --- # 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.b2core.b2broker.com/how-to-articles/manage-mailing-options.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.