Just wondered because my outbox is full of PMs on different subjects to various members.
Perhaps the ‘Privare Messages’ banner at the top of the page could be set to change colour when a PM is sent to people.
Failing that, or until it can be arranged, maybe reminders can be posted here so that people are aware that messages await them.
Bluffcove you have a PM.
As do you Firefly.
Edited to add a name.