I have followed all your instructions but still my confirmation cannot be sent which is I don't know while, it was working before but after they upgrade to new versions for me never worked again. Any help, please.

Ensure that your Dolphin's cron job is active and properly configured - runs every minute.
Below is the legacy version of the Boonex site, maintained for Dolphin.Pro 7.x support.
The new Dolphin solution is powered by UNA Community Management System.