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OK - you clearly aren't going to tell me what you tried from the link, so let's do it the long way:

1 - did you make sure mail.jar and activation.jar and in your appserver are compatible versions...

So did none of the solutions in the thread I linked to work?

Please post up the code you tried for them.

This thread may help (from googling for 'no object DCH for MIME type multipart/mixed').

I don't usually act like a Google front-end, but I'm in a good mood...