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I must have been thinking about the message you posted to
the email sig, which uncovered the bug I commented on, and
fixed.  In the case of the original bug report, I don't
believe this is fixable.  There is, however a simple
workaround for you.  In your sample code, set the outer
message's epilogue to the empty string, e.g.:

msg1.epilogue = ''

...

msg2.epilogue = ''

This will cause the Generator to add a newline at the end of
the outer message.  We can't make that change in the Message
class because doing so would break inner message flattening.

However, if someone were to come up with a patch that fixes
this problem yet doesn't break any of the 217 tests in the
current test suite, I'd be happy to look at it.  As it is,
nothing will be changed for Python 2.4. final.