🚀 go-pugleaf

While in rmail, editing a message via the w command, I must have goofed, and
when going back to ordinary rmail mode (via C-c), I wound up with a confused
RMAIL file in which several messages have been appended into one, and the
attempt to step past the aggregated message now gets me an error message
of the form 
	Invaild search bound (wrong side of point)

Also, the header summarizing no longer works ("end of buffer" message).

Any suggestions on how to fix this?  (The rmail file is big enough that I'd
rather not trash it and start over.)