[chrishajer]

Does any of this help?

https://bbpress.org/forums/topic/where-is-the-setting-for-mail-server-config

https://bbpress.org/forums/topic/mail-senging-problem-with-mail-function

https://bbpress.org/forums/topic/users-dont-receive-password-after-registration

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

Edit – I see you found the last one.