Note: Mail Attachments Iconizer has been upgraded to Attachment Tamer. If you have a license for Iconizer, you can download Attachment Tamer as a free update.

This is a bug in Apple Mail unrelated to Mail Attachments Iconizer. Modern cameras and image editing software often store information about orientation separately from the image data itself in a so-called EXIF section. Certain applications including most web browsers and Apple Mail ignore EXIF orientation.

Workaround: There's no need to worry, the EXIF information is preserved, unless you use Mail to resize the image. The recipient will be able to view the image in the correct orientation using EXIF-aware software. Likewise if it is in a message you have received, just open the image in the Preview application.