The Sender Pro functionality supports the notification that the subscriber has read the letter. For this purpose, an option to add a specific 1×1 pixel image to the text of the letter is included. This function is available when sending a message in the HTML format.
In order to enable the option to send letters with notification, you have to follow these steps:
- Go to plugin settings ("Admin Panel"->"Sender Pro"->"Settings").
- Make sure that “Email in HTML format sending” and “Send email with confirmation” options are enabled.
- Save the settings if necessary.
Warning! Due to security policy peculiarities, receiving a notification that the subscriber has read your letter may be impossible with some mail services.