Yes that might take a while for us as well .
We are also users like you for buddypress .
Hi, good news, I found the solution... and it was already in your forum: cf. https://wplms.io/support/forums/topic/emails-sending-in-plain-text-not-html
The relevant part for me was:
You can send the HTML emails via basic PHP mail() function.
Go to wp-admin->Plugins->Editor->Choose WLMS Customiser Plugin.
Edit the wplms-customiser.php file, add this code and save. Refer to this Screenshot: https://prntscr.com/fe50km
add_filter( 'bp_email_use_wp_mail', function() { return false; },99);
I hope this will help others!