The Check-up section allows you to perform one last check-up before sending the email message.
This section allows you to check a number of features pertaining to the settings of your email.
In addition, the Check-up section allows you to analyze if the HTML code has any errors (HTML code tab), if your email has any spam words (Spam check), and how mobile-friendly your email is (Mobile).
It is recommended to optimize your email based on the Spam check report. View: