You can track email open rates in Google Analytics by using UTM parameters. First, you must create a unique URL for each email campaign. You can use the Google Analytics URL Builder to add UTM parameters like "utm_source," "utm_medium," and "utm_campaign." Next, you should include these tracked links in your emails. When recipients click the links, Google Analytics will capture the data. You must ensure that your email platform allows tracking through these parameters. Afterward, you can view the results in Google Analytics under Acquisition > Campaigns. This will show how effective your email campaigns are.