Sending e-mail with an embedded image that includes the
image as a part of the message identified by Content-ID
does not work.
When sending a message to the list with an embedded
image, the message arrives and is archived where the
image intact. The MIME headers for the message
reference a <img src="cid:xxx"> and there is a header
on the mime component for "Content-ID: <xxx>"
However the message that gets delivered to the list
members does not include the Content-ID. The embedded
image is still included in the message, but is not
displayed because of the missing header.