The best way to alter the notification template is to

  1. create a new campaign
  2. select the notification template in the dropdown menu in the editbar (next to the save button)
  3. change the content, images and links but keep the {headline} and the {content} tags
  4. save the template and check the “overwrite” option without changing the template name

You can also change the template at Newsletter => Templates by clicking on the “Edit HTML” link.

To edit the template via FTP you have to located your upload folder (normally wp-content/uploads/mailster) and find your template in the “templates” folder

Make changes and overwrite the exiting files in the templates folder

Changing template files within the plugin folder doesn’t have an effect and your changes get overwritten with the next update