SPF record checker
SPF checker: read a domain’s SPF record, list its mechanisms e count the DNS lookups against the limit di 10.
Queries go a Cloudflare’s public DNS over HTTPS service when you press the button. Up a 15 queries are made a follow include records.
Informazioni su SPF record checker
SPF checker: read a domain’s SPF record, list its mechanisms e count the DNS lookups against the limit di 10.
Fa parte della sezione «Dati e reti» di SmartCalcy. Funziona nel tuo browser senza account, usa la tua valuta e le tue unità (modificabili in cima alla pagina) e fornisce stime solo a scopo informativo, quindi verifica le indicazioni ufficiali prima di fidarti di un risultato.
Come usare il SPF record checker
Cosa calcola e quando usarlo
Reads a domain’s SPF record, the list di servers allowed a send email per it, e checks it per common faults: more than one record, a missing “all” policy, e more than 10 DNS lookups, which makes SPF fail. It follows include records a count the lookups.
Come si usa, passo dopo passo
- Enter the domain, per Esempio Esempio.com.
- Press “Check SPF”.
- Read the verdict e the number di DNS lookups used out di 10.
- Review the mechanisms list e qualsiasi warnings.
Cosa significa ogni dato
- Domain Nome – The domain used a the sender’s address.
Come leggere i risultati
- Verdict – Looks valid, o Needs attention when a problem è found.
- Policy – What happens a mail from servers that are not listed: hard fail, soft fail, neutral o allow.
- DNS lookups – Lookups needed by includi, a, mx, ptr, exists e redirect terms, compared with the limit di 10.
- Mechanisms – Every Durata a the record, with included records indented beneath their parent.
La formula
The record è the TXT value starting v=spf1. Each include, a, mx, ptr, exists o redirect term costs one DNS lookup, e included records add their own. ip4 e ip6 terms e “all” cost none. The RFC limit è 10 lookups.
Un esempio pratico
v=spf1 includi:_spf.Esempio.net a mx -all uses three lookups per its own terms plus those inside the included record, e finisce a -all, so unlisted servers are rejected.
Ipotesi e limiti
- A most 15 queries are made while following includes, e nesting stops dopo 5 levels.
- A domain may need a record only per mail it sends. Domains that send no mail should publish v=spf1 -all.
- The check does not test whether a particular server would pass.
Errori comuni
- Publishing two SPF records. Only one è allowed, so merge them into one.
- Ending with +all, which lets anyone send as your domain.
- Adding every email service as an includi e passing 10 lookups, which giri SPF into a permanent error.
Domande frequenti
What è SPF?
Sender Policy Framework è a DNS record that lists the servers allowed a send email per a domain.
What è the difference between -all e ~all?
-all asks receivers a reject unlisted senders. ~all asks them a accept but mark the mail as suspicious.
Why è there a limit di 10 lookups?
It stops a record dalle forcing receivers into lunga chains di DNS queries. Going superato it makes SPF return a permanent error.
Is SPF enough a stop spoofing?
No. Use it with DKIM e DMARC.
Does this tool send email?
No. It only reads DNS records.