I Suggest that as you created this group you should at least obey the GrabCad rules !!!
Do not post any contact information (yours or anyone else's) in public spaces on GrabCAD. This includes email addresses, phone numbers, passwords or WhatsApp contact details. You are welcome to share this information with someone directly over a private message, or display this information on your profile page, but it is not allowed anywhere else on the site(This includes Model pages, Tutorials, Questions and Groups). Also you must not use your contact information in a private message or your profile for the use of selling models or services.