How to link to img src using HTML email template in WordPress

You are trying to link the image to a relative path ../wp-content/. For the link to work in an e-mail, where the path isn’t known to the reader, you must use the complete full path including http:// or https://. Like this: http://yoursite.com/wp-content/uploads/2017/10/logo-full.jpg

How to always display full size image

Not a PHP solution, but below is a jQuery option. var images = $(‘.entry-content img’); images.each(function() { var src = $(this).attr(‘src’), // removes the img size off the src e.g -300×300. newsrc = src.replace(/-\d+[Xx]\d+\./,’.’); $(this).attr(‘src’,newsrc); }); You would need to remove some of the classes e.g size-thumbnail