Embedded pictures are lost when redirect mail from Lotus Notes to GoogleGroups

Case:
Develop agent to send incoming mail (from any to Lotus-Notes mailbox) to (another) specified email address.
Redirect an email with embedded pictures to {groupname}@googlegroups.com. Embedded pictures are not included in G.Group's discussion post.
Manually, forward same email to same G.Group, embedded pictures are included in discussion post.