There is still a bug in Mautic as of 5.2.7 that doesn’t allow for sending of pure plain text emails. Even after deleting all of the code in the html box, Mautic attempts to fill it back in and sends gibberish to receivers instead of the plain text. Here is the email Mautic sends after deleting the code:
p, li {margin:0 !important; padding:0; line-height:1.4em; font-family:‘Open Sans’, Helvetica, Arial, sans-serif;}
Hello World!
Lorem ipsum dolor sit amet, consectetur adipisicing elit. Aliquid officia consequatur placeat reprehenderit excepturi, tempore, id quos quaerat ab fuga.
Lorem ipsum dolor sit amet, consectetur adipisicing elit. Inventore, voluptate.
Lorem ipsum dolor sit amet, consectetur adipisicing elit. Dignissimos alias rerum nemo ducimus modi perspiciatis.