I keep sending letters, but I don't know if the subscriber read them. Is there a way I can check it?

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:

  1. Go to plugin settings ("Admin Panel"->"Sender Pro"->"Settings").
  2. Make sure that “Email in HTML format sending” and “Send email with confirmation” options are enabled.
  3. 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.

This article related to Sender plugin

Additional resources: Sender - User Guide

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