Why don't you have user forums?
Postbox does not make available unmoderated user-forums as some recommendations could result in data loss.
For example, imagine having an issue with an account in Postbox, and a forum member recommends that you delete the account and start over. Perfectly safe in the eyes of the forum member, because they always use IMAP. But if you happen to be using POP, and then delete that account, you will delete all of the messages contained within that account (except for Inbox messages in certain circumstances). A lifetime worth of email... permanently deleted.
While most Postbox users are fairly tech-savvy, many are not, and some subtleties could get lost in translation for our non-English speaking visitors. At the end of the day, if recommendations are provided within a page that has our company name and logo on it, we're ultimately responsible.
If Postbox was an image editor, music app, game, etc. we would feel differently about forums. But Postbox is a different kind of app, because email is the closest thing we have to a "life database." Everything is in there, and it is really easy to lose all of it if one is not careful, or don't have backups, or not using IMAP, etc.