Doubt in email notification

Hello friends,
I have doubt in email notification like i need to know which all emails has been opened from which i have send how i will get the clarification

   please avoid telling the coding used by sending the image give me any another way and that should be applicable for all email account...

 please help me through codings...

because if the image field is removed from some bodies email account means it will be problem so give me another way which all the newsletter members will do …

       waiting for your replies as soon as possible

Thank You

I think the only method anywhere near reliable is the image method.