DD: Doesn't seem to be marking read mail as read

In DDMsgReader I select an email and read it. All good.

I quit then go into view Unread messages and the message I read is showing.

I'm using this as my menu option.

  case 'U':       // Read your un-read mail
                        bbs.read_mail(MAIL_YOUR, user.number, LM_UNREAD|LM_REVERSE);

Let me know if I shoudl be calling it with a different set of parameters.