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Network & infrastructure
An email authentication protocol that specifies which mail servers are authorised to send email on behalf of a domain, allowing receiving servers to reject email from unauthorised sources.
In plain English
SPF is a list published in your DNS records that says: "Only these mail servers are allowed to send email from our domain." When a receiving server gets an email claiming to be from your domain, it checks the SPF record. If the sending server isn't on the list, the email can be flagged as suspicious or rejected.