The Personal Message system on the NARGS Forum is a little different than more full-featured email systems. On the NARGS Forum, there is simply an Inbox & Outbox, the Outbox is equivalent to a "Sentbox" or "Sent Mail" view.
When sending a message to another forumist, check the box "Save a copy in my outbox" to preserve a copy of the sent message in your Outbox (see photo 1). By default, this option is unchecked, and can be a nuisance to remember to check it each time a message is sent.
To permanently turn this option on, do the following (see photo 2):
1 On the main Forum menu, click on Profile
2 On the Modify Profile menu on the left side, click on Personal Message Options
3 Make sure "Save a copy of each Personal Message in my outbox by default" is checked.
4 Optional: set the behavior on how you want to be notified about new Personal Messages on the forum.
5. Click the Change Profile button.