demime conditon and Lotus Notes

Looks like demime conditon like this:
  deny  message = This message contains an unwanted file extension ($found_extension)
        demime =zip

doesn't stop Lotus Notes Attachments like this:

MIME-Version: 1.0
Content-type: multipart/mixed;
        Boundary="0__=4EBBE420DFA7B1EC8f9e8a93df938690918c4EBBE420DFA7B1EC"
Content-Disposition: inline

--0__=4EBBE420DFA7B1EC8f9e8a93df938690918c4EBBE420DFA7B1EC
Content-type: text/plain; charset=ISO-8859-2
Content-transfer-encoding: quoted-printable

Text

=

--0__=4EBBE420DFA7B1EC8f9e8a93df938690918c4EBBE420DFA7B1EC
Content-type: application/zip;
        name="=?ISO-8859-2?Q?psref276=2Ezip?="
Content-Disposition: attachment; filename="=?ISO-8859-2?Q?psref276=2Ezip?="
Content-transfer-encoding: base64

UEsDBBQAAgAIAFFBzjDDSkeALgEcABJyKAAMAAAAcHNyZWYyNzYucGRm7Lp1VF3Lsi8MBAhuCe7u
sNbC3d0tECS4u3twt+DuENydQPAEdwlOsOBuQR8kO/vss3Pu/c6933hjvD/OWqPW7K7uruqqrvr1
nLMXubywKD2QgQWRfHVtZAIRDsQMABEBiKz1zIi4uRmlTa0Mde1M3QwNiICM0kQgVhYAKzOIUY7o


This file is recognized as psref276.zip ZIP by Outlook, but looks like 
it is not by exiscan (rev. 21).
Probably is something wrong with QP usage in Notes, because mutt also doesn't 
recognize filename correctly (it shows ?ISO-8859-2?Q?psref276=2Ezip?=).

Any advices?

-- 
Dariusz Sznajder