Absolutely right. font-lock-mode toggled off and the problem goes away.
>>>> "Mike" == Mike Kupfer
<mike.kupfer(a)xemacs.org>
>>>> at time = Fri, 05 Dec 2008 06:39:05 -0800, wrote:  
  Mike>
>>>> "Rick" == Rick Baartman
<baartman(a)lin12.triumf.ca> writes: 
  Rick> If I am composing it under
MH-Letter mode in XEmacs, go to the
  Rick> end of the To: line and hit return, I get the error message
  Rick> attached to this message, endlessly repeated.
  Mike>
  Mike> Okay.  I've seen something similar with a newer version of
  Mike> MH-E.  I'll review my notes when I get a chance (over the
  Mike> weekend, I hope).
  Mike>
  Mike> If you have font-lock turned on, one workaround might be to
  Mike> disable it.
  Mike>
  Mike> mike
  Mike>
  Mike>
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