Version: (using KDE 3.5.9)
Installed from: SuSE RPMs
If the mail body (text/plain) or parts of a multipart mail consists of lines with header-like formatted content, eg.
Note: foo bar
the "Note:" part is displayed like email headers (bold) when using the "View Source" option.
Most likely, this behavior is because in case of mime/multipart mails, this is an easy way to highlight Content-Type related headers of all mime parts.
Unfortunately, mail bodys consisting of phrases like
CEO: Wilbert E. Smith
and the like are rather common.
*** This bug has been marked as a duplicate of 88271 ***