Thanks for forwarding. I wanted to confirm that was a standard WordPress email (which it was), which would have been sent through the wp_mail() function, which proves your mail service does actually work.
You can get all previous versions of BuddyPress on https://wordpress.org/plugins/buddypress/developers/
Email delivery is a bit of black box. I am going to find or build a plugin to help us debug whether BuddyPress thinks it sent the email correctly or not.
Where is your site hosted? Is it http://intention.nl/ ?
