Email open notification - ruby on rails

Question

If I will send 100 email to the registered user and I want to know if users open email or not

How can I do this using Ruby on Rails?

Answer 1

I am not very familiar with ruby but have written multiple mass mailer apps. You can use a webbug image to get an approximate open rate. Basically it is just a one pixel or transparent image with some tracking information:

What I do is make a directory called trackingimage.gif with an index in it that reads and stores the url params and then relocates to the real image.