{"version":"1.0","provider_name":"idealsmtp","provider_url":"https:\/\/www.idealsmtp.com\/blog","title":"Email Headers- The Hidden Backbone of Every Email - idealsmtp","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"hSUL4StkZk\"><a href=\"https:\/\/www.idealsmtp.com\/blog\/email-headers\/\">Email Headers- The Hidden Backbone of Every Email<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/www.idealsmtp.com\/blog\/email-headers\/embed\/#?secret=hSUL4StkZk\" width=\"600\" height=\"338\" title=\"&#8220;Email Headers- The Hidden Backbone of Every Email&#8221; &#8212; idealsmtp\" data-secret=\"hSUL4StkZk\" 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<\/script>\n","thumbnail_url":"https:\/\/www.idealsmtp.com\/blog\/wp-content\/uploads\/2025\/06\/Email-Headers.webp","thumbnail_width":900,"thumbnail_height":460,"description":"When you receive an email, the first thing you notice is the subject line, sender\u2019s name, and the message content. But there\u2019s much more happening in the background. Every email has a hidden part called the email header. This part includes important details that help track where the email came from, check if it\u2019s spam, [&hellip;]"}