From: Gary Furash on
Problem: Some users with Outlook 2007 receive HTML email bodies as attachment
(and no body in the email).

1. The application (PeopleSoft) generates the email.
2. In the MIME header of the application, it sets Disposition; inline and
Filename: to something (e.g., UA_CG_P01.htm).
3. A normal UNIX smtp server is used to forward the message to a
NON-MICROSOFT EXCHANGE email server (sending mail is postfix 2.2.9 and
receiving mail is Cyrus imap 2.3.9).
4. If the email is sent to a user with an account managed by an MS Exchange
Server OR the user connects to the CYRUS IMAP server mentioned in #3 with ANY
CLIENT OTHER THAN OUTLOOK 2007 (e.g., Eudora, Thunderbird, Google), the HTML
mail appears in the body of the message.
5. If the user connects to the email server in #3 with Outlook 2007, it
appears as an attachment that the user must double click on.
6. If I use some other tool to generate the exact same message (e.g., a Perl
script), set Disposition; inline but leave FILENAME blank in the MIME header,
the problem in #5 goes away. However, the PeopleSoft application cannot be
modified in this way. In addition, while there is a long-term plan to replace
the open-source server with Exchange, this cannot be done in the near term.

Question: given the above, what's happening? Is there any setting that can
be tweaked on the Outlook Client side to fix this (so that the body does not
appear as an attachment?