{"version":"1.0","provider_name":"SmartrMail Email Marketing Blog","provider_url":"https:\/\/www.smartrmail.com\/blog","title":"Best 9 Email Subject Line Tester Tools You Can Use | SmartrMail Email Marketing Blog","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"5zuVxMvgwF\"><a href=\"https:\/\/www.smartrmail.com\/blog\/subject-line-tester-tools\/\">Best 9 Email Subject Line Tester Tools You Can Use<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/www.smartrmail.com\/blog\/subject-line-tester-tools\/embed\/#?secret=5zuVxMvgwF\" width=\"600\" height=\"338\" title=\"&#8220;Best 9 Email Subject Line Tester Tools You Can Use&#8221; &#8212; SmartrMail Email Marketing Blog\" data-secret=\"5zuVxMvgwF\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/www.smartrmail.com\/blog\/wp-includes\/js\/wp-embed.min.js\n<\/script>\n","thumbnail_url":"https:\/\/www.smartrmail.com\/blog\/wp-content\/uploads\/2020\/09\/subject-line-tester-tools.png","thumbnail_width":1200,"thumbnail_height":603,"description":"Your subject line is often the only factor between an email being opened or ignored. That's why subject line tester tools are important to help ensure you're maximizing your open rate."}