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Sendmarc makes managing SPF easy, with tools to create, deploy, monitor, and optimize SPF records, helping your domain stay secure and compliant without the technical hassle.
Many businesses start by asking “What is SPF in email?” and why it matters for email security. The answer is simple: SPF protects your domain from spoofing and unauthorized senders.
For anyone still wondering ”What is SPF?” it’s the backbone of domain-level email protection that ensures only trusted servers can send on your behalf.
Toma el control de la seguridad del correo electrónico de tu organización
What is SPF in email? Sender Policy Framework (SPF) is an email authentication method created to prevent email spoofing. It does this by allowing domain owners to specify which email servers are authorized to send email on behalf of their domain. This is achieved by publishing a special TXT record – known as an SPF record – in the DNS. Understanding “What is SPF in email” often comes down to looking at real record examples.
Un registro suele tener la siguiente estructura:
Host | Tipo | Valor |
---|---|---|
@ | TXT | v=spf1 [mechanisms] [qualifiers] |
He aquí un ejemplo de lo que podría ser un registro:
Host | Tipo | Valor |
---|---|---|
@ | TXT | v=spf1 mx include:spf.protection.outlook.com ~all |
Grasping “What is SPF in email” means understanding that every mechanism and qualifier inside the TXT record plays a role in protecting your domain.
To fully answer the question “What is SPF in email?”, you also need to know about the mechanisms that define authorized servers.
Los registros SPF utilizan un conjunto de mecanismos para definir qué servidores de correo electrónico están autorizados a enviar correos electrónicos en nombre de un dominio. Estos mecanismos determinan cómo el servidor receptor valida la dirección IP del remitente.
Los mecanismos más utilizados son:
ip4 & ip6:
Especifica las direcciones IPv4 e IPv6 autorizadas.a:
Autoriza cualquier dirección IP asociada a los registros DNS A o AAAA del dominio.mx:
Autoriza las direcciones IP de los servidores Mail Exchange (MX) del dominio.include:
Referencias al registro SPF de otro dominio. Esto se usa comúnmente cuando proveedores externos están autorizados a enviar correos electrónicos en nombre del dominio.Another important part of understanding “What is SPF in email” involves qualifiers. Qualifiers determine how the receiving server should handle emails that don’t match the specified mechanisms:
+all:
Pass (el correo electrónico se acepta aunque no coincida con ningún mecanismo)-all:
Fail (el correo electrónico se rechaza si no coincide con ningún mecanismo)~all:
Softfail (el correo electrónico se acepta pero se marca como sospechoso si no coincide con ningún mecanismo)?all:
Neutral (el correo electrónico no se acepta ni se rechaza - este calificador trata el mensaje como si no hubiera Política SPF)Los modificadores en los registros SPF proporcionan funcionalidad adicional. Ayudan a mejorar la flexibilidad y la claridad de SPF políticas.
Los dos modificadores más utilizados son:
redirect:
Redirige el SPF Consultar la política de otro dominio. Esto es útil cuando la política de correo electrónico de un dominio está completamente gestionada por otro dominio.exp:
Define un mensaje personalizado que se puede mostrar cuando un SPF La comprobación falla, lo que ayuda a explicar por qué se rechazó el correo electrónico.When explaining “What is SPF in email,” it’s usually broken into four stages:
This step-by-step flow shows “What is SPF” in action, turning policy settings into real-time protection against spoofing.
¿Quieres saber más?
Those researching “What is SPF in email” often realize it works best when combined with DomainKeys Identified Mail (DKIM) and Domain-based Message Authentication, Reporting, and Conformance (DMARC).
SPF works alongside these email authentication protocols to provide a more comprehensive approach to email security. When implemented together, these protocols help protect domains from spoofing, phishing, and other types of email-based attacks.
By learning “What is SPF in email” and how it integrates with DKIM and DMARC, you gain a full picture of modern email authentication.
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What is SPF in email? Sender Policy Framework (SPF) is an email authentication protocol that enables domain owners to specify which IP addresses are authorized to send emails on behalf of their domain. This helps prevent email spoofing and improves the trustworthiness of outgoing messages.
When organizations ask, “What is SPF best for?” the answer is preventing spoofing, phishing, and improving deliverability. It also helps ISPs and email platforms validate incoming emails and filter out unauthorized messages.
No, you can’t have multiple SPF records for a single domain. Instead, all authorized IP addresses and mechanisms must be included within one SPF record. Having multiple records will cause SPF validation to fail.
SPF se integra con DomainKeys Identified Mail (DKIM) y autenticación, informes y Domain-based Message Authentication, Reporting, and Conformance (DMARC) para proporcionar autenticación de correo electrónico en capas. DKIM utiliza firmas criptográficas para confirmar la integridad del contenido del correo electrónico, mientras que DMARC combina los resultados de verificación de SPF y DKIM y permite a los propietarios de dominios establecer políticas para manejar fallas de autenticación.
It is important to keep SPF records updated to ensure that all authorized email-sending servers are correctly listed. One of the key lessons from learning “What is SPF” is that records must stay updated; otherwise, legitimate messages risk being rejected.
In summary, understanding “What is SPF” is essential for anyone who wants to secure their email domain and build trust with recipients.