SPF (Sender Policy Framework) is an email authentication method that defines which mail servers are allowed to send emails on behalf of your domain.
It is configured as a TXT record in your domain’s DNS settings. This record lists the servers or services that are authorized to send emails from your domain.
When a receiving mail server gets an email, it checks the sender’s domain SPF record. If the sending server is listed in the record, the SPF check passes. If it is not authorized, the email may be rejected or marked as spam.
Prevents domain spoofing
SPF helps prevent attackers from sending emails that appear to come from your domain.
Improves email deliverability
Mailbox providers check SPF when filtering emails. Messages that pass SPF authentication are more likely to reach the inbox.
Protects your sender reputation
By restricting which servers can send emails from your domain, SPF helps protect your domain reputation.
Supports DMARC authentication
SPF works together with DKIM as part of DMARC authentication to help mailbox providers verify legitimate emails.