[@_ck_ Participant 16 years, 4 months ago]

It really is that simple – just make HowToGeek’s code into a plugin and install swiftmailer:

https://bbpress.org/forums/topic/trick-to-fix-some-email-problems-with-08x-plugins-on-09x#post-15776

That reminds me to fix some of my plugins so they use bb_mail() instead of mail() directly.