Subject: | Auto-generated Content-ID header does not include "<>"s for multipart/related |
When you attach a "multipart-related" MIME part with "Id => $gid", the
auto-generated Content-ID header does not enclose $gid in <>s.
Without the surounding <>'s mail clients like GMail do not display the
attached image inline but show as an attachment.
Simple Workaround of using Id => "<$gid>" solves the problem.