Mail_mime with text/html and images

Hi, I've got a question with Mail_mime class : When sending multiparts mails with text, html and images, under Sylpheed the mail received looks like this : ----> text/plain ----> multipart/related -----------> text/html -----------> each images But that does not seem to be working on every version of Outlook : sometimes it displays the text part. In http://www.cpan.org/modules/by-module/MIME/MIME-Lite-HTML-1.5.readme it is said that if images and text are present, construction use is : --> multipart/alternative <<< ------> text/plain ------> multipart/related -------------> text/html -------------> each images Has someone already been faced with this problem ? Is there any known solution ? -- Frederic Poeydomenge