A Mime question

Hi,
        I'm using a rather old version of Zmail to view my mail, and it handles
mime, except for sturr from Microsoft Outlook with an error about bad
separators.
        Upon examination, it seems that there are plus signs in the separators.
Is this allowed in mime, or is it a Microsoftism?
        It's kind of Ironic, as I'm using zmail to avoid using outlook.

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Matthew Saroff
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