[Mimedefang] strange file name lenght

[Marco Berizzi]

Hi all.
I'm using MD 2.6 with sendmail 8.12.3
My filter allow .ppt. This is the relevant section of the
filter.

  if (re_match_ext($entity, 
'^\.(mpp|pcx|pps|xls|rtf|doc|ppt|zip|gz|tgz|Z|rar|arj)$')){
	return action_accept();
    }

All other thing is reject (I bounce the entire message).

However MD doesn't recognize this as an ppt:

Content-Type: application/vnd.ms-powerpoint;
	name="=?iso-8859-1?Q?marchio_societ=E0_del_gruppo_AIVE=2Epp?=
	=?iso-8859-1?Q?t?="
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
	filename="=?iso-8859-1?Q?marchio_societ=E0_del_gruppo_AIVE=2E?=
	=?iso-8859-1?Q?ppt?="


Any idea?

TIA


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