I'm sorry, but the knowledge sources do not contain a specific guide on how to ask questions on the Grails users mailing list at
https://lists.apache.org/list.html?users@grails.apache.org. However, several official Grails blog posts and announcements mention the mailing list and provide instructions on how to subscribe and participate. They also advise not to include any personally identifiable information (PII) in your messages, as all emails are publicly archived and accessible to anyone. Make sure your email client does not add your signature with personal details like your address, phone number, or email address when posting to the list [Apache Grails 7.0.0-M4 Release Announcement](
https://grails.apache.org/blog/2025-06-10-grails-7-m4.html), [Apache Grails 7.0.0-M5 Release Announcement](
https://grails.apache.org/blog/2025-07-15-grails-7-m5.html). If you need more detailed guidance on how to ask effective questions, you might consider following general best practices for technical mailing lists, such as being clear and concise, providing relevant code or error messages, and specifying your Grails version. But for Grails-specific instructions, the knowledge sources do not provide a dedicated guide.