Mail adapter multipart message problem

Hello everyone.
I'm experiencing problem with receiver mail adapter. In XIPAYLOAD mode (keeping attachments, use mail package, content encoding - none) messages that has multipart mime type (multipart/alternative exactly) are processing strange way (messages are made from MS Outlook). XI keeps service information and change some symbols words become unreadable. For example.
--_000_135E4C842D542241894122FD84C52E1D4134A33A81mail2itransit_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hello world! This is text of multipart message! --_000_135E4C842D542241894122FD84C52E1D4134A33A81mail2itransit_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Hello world! T= his is text of multipart message!
000135E4C842D542241894122FD84C52E1D4134A33A81mail2itransit_
You can see T= his instead of This. And also why in main payload (<Content> field) it keeps info about all parts of whole message.
Attachments are kept correctly.
Any suggestions how to avoid this problem and keep just useful info (just text with correct symbols)?
I'm running XI 7.0 SP18.
Thanks in advance.
Edited by: Yaroslav Isachenko on Mar 24, 2010 2:31 PM
Edited by: Yaroslav Isachenko on Mar 24, 2010 2:42 PM

An OSS would not help, as this is an Outlook issue.
As far as i know, multipart/mixed works with all mail systems. maybe you give a try?
Could you post the first lines of your entries in Content tag and the entry and content-type also?

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