1.0FireStorm ISPhttps://www.firestorm.ch/en/rich600338<blockquote class="wp-embedded-content" data-secret="t3qWvIma8J"><a href="https://www.firestorm.ch/en/kb/spf-entry/">SPF entry</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://www.firestorm.ch/en/kb/spf-entry/embed/#?secret=t3qWvIma8J" width="600" height="338" title="“SPF entry” — FireStorm ISP" data-secret="t3qWvIma8J" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript"> /* <![CDATA[ */ /*! This file is auto-generated */ !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); //# sourceURL=https://www.firestorm.ch/wp-includes/js/wp-embed.min.js /* ]]> */ </script> What is an SPF entry? An SPF record is a TXT record stored on the DNS server for your domain. With an SPF entry, you tell other mail servers which IP addresses are authorized to send mails via your domain. An SPF record is therefore a protection against spammers who abuse your e-mail address. By […]