The only 2 options available are 'mark read' or 'mark unread', there is no option to delete PM's received via openenergymonitor.org.
I was doing some housekeeping this morning and noticed that the 'delete' option had disappeared. Not a big issue, but an opportunity to minimize server space.
Thanks for letting us know, it was a permission issue. It's now been fixed, you should now be able to delete messages. Good to see the message system being useful!
All the best,
Open-source tools for energy monitoring and analysis. This project uses the GNU General Public Licence