I was typing a lengthy PM and then posted it or at least I thought so. To my surprise it didn't post. Apparently I was logged out while doing this so it didn't post. At least nothing is listed in my SENT folder. Instead of recomposing the whole message again is there a way to recall my text?

On a desktop/laptop, go back into your PM editor. At the bottom left of the text box, there should be a "Restore auto-saved content" button. Click that. It should recover.