{"version":"1.0","provider_name":"Mailrelay","provider_url":"https:\/\/mailrelay.com\/en\/","author_name":"Mailrelay","author_url":"https:\/\/mailrelay.com\/en\/blog\/author\/mailrelay\/","title":"Email preheader - Mailrelay","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"bHY2KBsvKc\"><a href=\"https:\/\/mailrelay.com\/en\/glossary\/email-preheader\/\">Email preheader<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/mailrelay.com\/en\/glossary\/email-preheader\/embed\/#?secret=bHY2KBsvKc\" width=\"600\" height=\"338\" title=\"&#8220;Email preheader&#8221; &#8212; Mailrelay\" data-secret=\"bHY2KBsvKc\" 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:\/\/mailrelay.com\/wp-includes\/js\/wp-embed.min.js\n<\/script>\n","description":"In the world of email marketing, the preheader, also known as \u201csnippet\u201d or \u201cpreview text\u201d, is a line of text that is displayed just after the subject line of each email. This small snippet of text will be visible to the recipient before they even open the email, as it will be displayed in the [&hellip;]"}