by VideoViking
»
September 4th, 2015, 2:37 pm » Short link
When a PM is sent to a user, phpBB adds an "unread" flag to the sent message. This is called a receipt. The receipt stays in the Outbox until the user reads it. Once it's opened, it disappears from your outbox. This is pretty much common practice in art sites like DeviantArt, but instead of a separate folder tracking read notes (their version of PMs), the note icon is highlighted in yellow. If the user reads it, the icon dims to a shade of grey.
I recall certain webmail programs using this feature, but it's been a long time since I've seen it in action. For me, personally, this is a good way to keep track if your note was "read," not sent.