Mailmanager - embeded images are not shown

1. Add a mail box to Mail Manager
2. Send an email to this mailbox from a different email with an embedded image. Follow below steps 1. Copy & paste image using any snipping / screen capture tool 2. Use Outlook or similiar email client (gmail signature too having problem)

The embedded image comes as attachment. Seems like the CID(Content Id) might be the problem.