You forget that you already have a functioning record for Gmail and create a new one. You are asked by a new email service provider, let’s say Mailgun, to create an SPF record. In practice, multiple SPF records of your domain will be declined by the recipient server, so what’s the point of having more than one entry? As a rule, duplication of DNS TXT record happens by accident. This is explicitly defined in RFC4408:Ī domain name MUST NOT have multiple records that would cause an authorization check to select more than one record. Here is an off-the-reel axiom: one SPF record for one domain. The focus will be on the second most common error setting up multiple SPF records for a single domain. In this article, we’ll talk about practical matters and how to avoid common SPF issues.
Earlier in “ SPF Records Explained” we provided a detailed look into this concept. It is implemented via TXT type records known as SPF records. Sender Policy Framework (SPF) is a protocol used by mail servers to authenticate emails.
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