1.0FireStorm ISPhttps://www.firestorm.ch/en/rich600338<blockquote class="wp-embedded-content" data-secret="cedgE0dwEa"><a href="https://www.firestorm.ch/en/kb/change-spf-entry/">Change SPF entry</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://www.firestorm.ch/en/kb/change-spf-entry/embed/#?secret=cedgE0dwEa" width="600" height="338" title="“Change SPF entry” — FireStorm ISP" data-secret="cedgE0dwEa" 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> By default, all our domains already have the correct SPF entry to send emails. If you want to use an external or your own mail server, you have to change the SPF entry. We’ll explain exactly how it works here. Possible error message when sending: 550 SPF check failed   You need: IP address of […]