Is the original located somewhere online where anyone can see it? Only in that email, in an account that you have to log in to? Only in an email on your computer?
There are ways you can copy an image from an email to your hard drive, upload it to an album at your profile, and link to the copy that's in the album.
When reposting pictures from other sources, we hope members will remember our Community Guidelines:Can I post other people's images and photos I found on the Internet here?
Generally, photographs and images on other sites are copyrighted and cannot be used in the forums without the express permission of the author. Please do not post images or photos from other websites without first obtaining the author's permission. Any such copyrighted material will be removed without notice.