Could not analyse message

[Amelein at dantumadiel.eu]

We keep getting some newsletter which keeps 'breaking' MS where it'll just reject the message on the account of it not being able to read it.
The actual message is just plain text (html) as far as I can tel. 
We're still running MS 4.66.5 and we're going to re-invent the wheel on a new server with all the latest versions since this one has served us very well but the OS has fallen far enough behind to warrant a clean install. But until then I need a way to ignore these e-mails and just pass them through unchecked, but I cant remember where and how to do this, adding them to the always.white list did not work (they get marked as non spam and then kicked out on the account that they can't be read).
 
Any suggestions ?
Arjan
 
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