SPF Record Checker: Analyze SPF TXT Records, Includes and Policy

.pag-pro{max-width:1180px;margin:0 auto;padding:28px 16px 54px;color:#111827;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif}.pag-pro *{box-sizing:border-box}.pag-pro h1{font-size:clamp(34px,5vw,58px);line-height:1.04;margin:0 0 12px}.pag-lead{font-size:18px;line-height:1.65;color:#374151;max-width:900px}.pag-panel{border:1px solid #dbe3ef;border-radius:8px;background:#fff;padding:18px;margin:18px 0;box-shadow:0 10px 24px rgba(15,23,42,.05)}.pag-form{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:end}.pag-form.three{grid-template-columns:1fr 220px auto}.pag-field label{display:block;font-weight:800;margin:0 0 6px}.pag-field input{width:100%;height:44px;border:1px solid #b8c3d4;border-radius:6px;padding:0 12px;font-size:16px}.pag-btn{height:44px;border:0;border-radius:6px;background:#2563eb;color:white;font-weight:900;padding:0 18px;cursor:pointer}.pag-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.pag-card{border:1px solid #e5e7eb;background:#f9fafb;border-radius:8px;padding:14px}.pag-card span{display:block;font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:#64748b;font-weight:900}.pag-card strong{display:block;font-size:18px;margin-top:6px;word-break:break-word}.pag-note{border-left:4px solid #2563eb;background:#eff6ff;padding:14px;border-radius:6px;color:#1e3a8a;line-height:1.6}.pag-good{border-left-color:#16a34a;background:#f0fdf4;color:#14532d}.pag-warn{border-left-color:#f59e0b;background:#fffbeb;color:#78350f}.pag-bad{border-left-color:#dc2626;background:#fef2f2;color:#7f1d1d}.pag-table{width:100%;border-collapse:collapse;margin-top:12px}.pag-table th,.pag-table td{border-bottom:1px solid #e5e7eb;text-align:left;padding:10px;vertical-align:top;word-break:break-word}.pag-table th{background:#f8fafc;font-size:13px;text-transform:uppercase;color:#475569}.pag-pre{white-space:pre-wrap;background:#0f172a;color:#e5e7eb;border-radius:8px;padding:14px;overflow:auto}.pag-error{display:none;color:#b91c1c;background:#fff1f2;border:1px solid #fecdd3;border-radius:8px;padding:12px;margin-top:12px}.pag-seo h2{font-size:28px;margin-top:34px}.pag-seo p,.pag-seo li{line-height:1.72;color:#374151}@media(max-width:850px){.pag-form,.pag-form.three,.pag-grid{grid-template-columns:1fr}.pag-btn{width:100%}} SPF Record Checker: Analyze SPF TXT Records, Includes and Policy Check the SPF record of a domain and understand which servers are allowed to send email. The tool detects SPF records, mechanisms, includes, IP ranges and the final policy such as -all, ~all, ?all or +all.

Domain Check SPF What is an SPF record? An SPF record is a TXT record that lists which mail servers are allowed to send email for a domain. Receiving servers can compare the sender with this policy to reduce spoofing and forged messages.

How to read SPF results include is used when a third-party service sends email for you. ip4 and ip6 authorize specific address ranges. -all is strict, ~all is soft fail, and +all is usually unsafe. FAQ Can a domain have multiple SPF records? A domain should normally have one SPF record. Multiple SPF records can create validation problems.

Does SPF protect the visible From address? SPF checks the envelope sender. DMARC is needed to align authentication with the visible From domain.

';try{var d=E('domain').value.trim().replace(/^https?:\/\//,'').split('/')[0];var data=await dns(d);var txt=(data.records||[]).map(flat);var spf=txt.filter(function(x){return x.toLowerCase().indexOf('v=spf1')>=0});var rec=spf[0]||'';var mechanisms=rec.split(/\s+/).filter(function(x){return x&&x!=='v=spf1'});var sc=score(rec.toLowerCase(),spf.length);var cls=sc.score>=80?'pag-note pag-good':sc.score>=50?'pag-note pag-warn':'pag-note pag-bad';var html=' Domain '+esc(d)+' SPF records '+spf.length+' Mechanisms '+mechanisms.length+' Score '+sc.score+'/100 '+(sc.notes.length?sc.notes.join(' '):'SPF looks consistent from this lookup.')+'

';html+=' SPF record '+esc(rec||'No SPF record found')+' Mechanism breakdown Mechanism Meaning '+mechanisms.map(function(m){var meaning=m.indexOf('include:')===0?'Authorizes a third-party SPF policy':m.indexOf('ip4:')===0?'Authorizes an IPv4 range':m.indexOf('ip6:')===0?'Authorizes an IPv6 range':m==='-all'?'Strict fail for all other senders':m==='~all'?'Soft fail for all other senders':m==='?all'?'Neutral result for other senders':m==='+all'?'Allows all senders':m;return' '+esc(m)+' '+esc(meaning)+' '}).join('')+' ';E('out').innerHTML=html}catch(e){err.textContent=e.message;err.style.display='block';E('out').innerHTML=''}}E('run').addEventListener('click',run);run()})();