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mime-related zmailer bug, corrupts mail

If a message like the one below is sent to a host that does not
advertise 8BITMIME, transports/smtp will normally mangle the message
horribly, by converting the _outer_ layer to q-p.

The requirements appear to be that

 - the message header says c-t-e: 8bit
 - the message header says c-t: multipart
 - at least one part says c-t-e: 8bit and contains an 8-bit character.

I've base64-encoded the example message in the hope that this message
will not trigger the bug. If I'm wrong, you can pick up the example
from ftp://ftp.troll.no/tmp/zmailerbug.