Is it possible to upgrade the app to work with the PHP mail system or SMTP mail of the website server or does it need special info that rely on third party services?
For me it's important because email costs are rising and I would like to send some bulk mailing by my own server.
And for that, would be great to have the features of Mail Bouncer, mainly not to send email for users that mark the email as spam or for those which mail boxes are rejecting emails.
I guess that xenforo bulk mail has these features even for PHP mail, but I am not sure.