Hi. Different guest who's trying to link back. It's still not working. If you go to your admin panel -> general -> security, you need to do this:
Unauthorize members with less than a week registration to post external links and emails :
No
Unauthorize guests to post external links and emails :
No
Disable external links to guests in messages :
No.
I have run Forumotion sites for years and once you set it to that, it usually works. Good luck!