Looking for this feature

I need the ability for the forum software to accept incoming emails and create a new thread for them... for example an email address topic@mydomain.com with the subject line "This is todays subject" would create a new thread, with the subject "this is todays subject" under the "topic" forum.... similarly an email to anothertopic@mydomain.com would be placed in another forum....  this is kind of like what "google groups" and yahoo groups does today....