Forwarding mail via XEmacs vm-mail command invisible in Thunderbird

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(XEmacs 21.5.28)

I occasionally forward mail from my laptop (Mac OS X + XEmacs + VM for
email) to my work email (Solaris 10 + Thunderbird 2.0.0.x via IMAP).  I am
not able to read the main message and no attachment is displayed.  The
content is there.  I can see it if I select View>Message Source from
T-Bird's menu bar.  I *can* attach and extract other objects.  For instance,
I just attached a .tar.gz file to my work email address.  I also verified
this misbehavior from my desktop machine at work (Solaris 10, XEmacs
21.5.28 and 21.4.21).  On Solaris I was using VM 7.17.  On Mac OS X I was
using VM 7.19.

Let me know if there's more documentation I can give of the problem.

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