What is Email opening rate?
Simply it means how many subscribers are opened the email that you have sent.
Just sending an email is not enough. You need to track your marketing efforts. Otherwise you end up spending your dollars on the email marketing campaigns that has no response or profits to you.
Your autoresponder software should capable of adding this one pixel image and tracking email opening rates.
Tracking an Email campaign can be done by-
* Email opening rates
* Click tracking rates
* ROI tracking after an email campaign
See the images below:
Here is the image to see how many subscribers opened Your email. (Note: This interface might be different for you based on the autoresponder program you are using.)

Here is the image to see how many subscribers ACTUALLY clicked on a link in the email. (Note: This interface might be different for you based on the autoresponder program you are using.)

How to track Email openings?
* By adding a pixel image in Your email: Usually your software adds a one pixel image to your outgoing email. This image will be tracked down by the script when your subscribers open the email. You have to remember ... these pixel images can be added only to your HTML emails. Text emails can not be tracked for email opening rates.
Drawback of this pixel image tracking is that NOT all email clients allow to display images in the emails. Image is an image, though it is just one pixel ... so these images are blocked by the email clients by default.
* By adding javascript: Adding a small javascript to track email openings is another way of tracking. But all email clients block javascripts running in the emails. This method once tried but failed miserably because of restrictions of email clients. If email clients detect javascript in the email, they push your email to junk or stop delivering them to your subscribers at all.
Try checking your email opening rates once in a while to see how you are doing!