The package can track when and how many times a subscriber opens a campaign.
Enabling open tracking
To use this feature, you must configure your email provider to track opens.
How it works under the hood
When you send a campaign, the email service provider will add a web beacon to it.. A web beacon is an extra img tag in the HTML of your mail. Its src attribute points to an unique endpoint on the domain of the email service provider.
Each time an email client tries to display the web beacon it will send a get request to email server. This way the email service provider will know the mail has been opened.
Via a web hook, the email service provider will let Mailcoach know that the mail has been opened.