Mac Mail IMAP shows read message when already read from other devices

Question

Mac Mail IMAP is setup on custom domain ([email protected]).  When I open an email message through my iphone it shows it was read.  Then when I go into the mail app on my iMac, it shows the message is unread.  It still shows unread hours later and even when I click the "Get Mail" button
How do I make it so that Mac mail syncs when I check mail through other devices?
Thank you

Answer 1

Open Terminal in Utilties and copy/paste
This will send the attachment embedded inline. (This works in Snow Leopard, but not sure about Lion. Do a test first. If it doesn't work, just google "send attachment embedded + Lion." You don't actually have to send the message to see how it will appear.)
defaults write com.apple.mail DisableInlineAttachmentViewing 0
To reverse the setting, change the 0 to a 1
However, whether this will work or not will depend on what the e-mail client on the receiver's end does with it.