User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.3) Gecko/20030319 Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.3) Gecko/20030319 RFC2387: http://www.rfc-editor.org/rfc/rfc2387.txt for multipart/related states in section 3.1: "The type parameter must be specified and its value is the MIME media type of the "root" body part." Sending a rich email (text/html) to myself and viewing the source you'll see a mime part with the header: Content-Type: multipart/related; which is missing the type parameter. Reproducible: Always Steps to Reproduce: 1. Start composing a message, make sure you are in rich text mode. 2. type some text as filler 3. inside that text insert an image, from the local file system. It's important that the image must be included in the message insteead of externally referenced. 4: Send the message to yourself 5: View the source and find any "Content-Type: multipart/related;" lines. The type paramter will be missing. Actual Results: I got a message with an improperly formed multipart/related mime part. Expected Results: Added the type parameter to the multipart/related Content-Type as per rfc. On line 36 of the message linked in the url field is the invalid multipart/related header.

Check line 36

I am experiencing this problem as well. This affects message viewing in squirrelmail. the Plaintext part is the only part shown, as squirrelmail can't determine the related part is text/html. Current workaround is to send as html only (options -> format -> rich text (html) only). -Josh

Although I don't like to code workarounds for non RFC compliant mail I just added a workaround to the SquirrelMail source (1.4.2 CVS and 1.5 CVS) so this Mozilla bug does not influent the displaying of multipart/related attachments anymore inside SquirrelMail.

William this might have been fixed by bug 351224. Could you take a few minutes and download the latest nightly ( http://ftp.mozilla.org/pub/mozilla.org/thunderbird/nightly/latest-comm-central/ ), backup your profile and test and let us know if this is fixed or not ?

Removing myslef on all the bugs I'm cced on. Please NI me if you need something on MailNews Core bugs from me.