As a user without an account who emails in “anonymously” to a category (which has “Accept emails from anonymous users with no accounts”) enabled, I want to be able to send multiple messages in to a topic without being rejected with a “title has already been used” error, so that I can post multiple messages to the same topic.
In other words, email@example.com sends a message firstname.lastname@example.org with email subject
Discourse is great. Because email@example.com doesn’t have an account, that person doesn’t get email notifications. However, they may log on to the web site and read replies. If that person then wants to reply, they should be able to send another email to firstname.lastname@example.org with the exact same subject line, and the content of that email should be appended to the topic.