@its7eleven,
Hmmm… what is this? This is not WordPress email and this is not wpForo email. You’re searching support in incorrect place. I think you have some Profile builder or membership plugin which does this, you should find it by disabling all plugins and activating those one by one. Once you find the plugin which sends this email please let us know too.
After testing all plugins, I’d also recommend to test the active theme, maybe this is the theme email. You should switch to some default theme to see that. But I hope the disabling of other plugins (not wpForo) will let you find the sender plugin.