I'd like to recommend creating a account so me or other members can assist you, as guest have limitations in replying here and if we need further Information to communicate with you.
I'll provide a link to register, please come back to your post so we can further assist you . Thank you
Are you referring to the checkmarks that your SMS software uses to indicate delivery status?
Or are you referring to the whole "was read" message that Apple's iMessage sends to all the non-iMessage users?