Hello, we have a strange problem.

We are sending out hundreds of mail messages via MAPI, the mail is
just 1 line of text with an attached RTF file.

all the clients recieve the mail correct, but 2 persons get the mail
messed up.

They receive the mail in plain text and the attachement also in plain
text in the mail message?

The clients with troubles are using outlook express.

does anyone have any idea why almost all the outlook expresses show
this mail correctly, and some don't interpret the mail correct and
just show the mime header and such in the mail message itself, and not
showing the attachement as attached file but show the content of the
attachment in the mail message?

This is how they see the mail body:

start mail
This is a multi-part message in MIME format.

------_=_NextPart_001_01C85831.50979616
Content-Type: text/plain;
charset="US-ASCII"
Content-Transfer-Encoding: quoted-printable

this is the line of text. attachedfile.rtf=20

------_=_NextPart_001_01C85831.50979616
Content-Type: application/rtf;
name="attachedfile.rtf"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename="attachedfile.rtf"

e1xydGYxXGFuc2lcZGVmZjB7XGZvbnR0Ymx7XGYwXGZuaWxcZm NoYXJzZXQwIENvdXJpZXIg
TmV3
.....
end mail