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How to Fix SPF Record Test in Technical SEO

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Technical SEO (search engine optimization) refers to the practice of optimizing a website for search engines in order to increase organic rankings. It includes crawling, indexing, rendering and website architecture optimization as part of its scope.

Businesses looking to ensure email deliverability must set up SPF (Sender Policy Framework) and DKIM authentication; however, SPF records often contain errors that compromise email deliverability.

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SPF (and its related domain-based message authentication, Reporting, and Conformance protocol DMARC) are email authentication protocols designed to safeguard domain names against spoofing attacks, phishing scams, or any other types of fraudulent email. By verifying if the sender IP is one of your approved IPs. This can be accomplished by publishing an SPF record in your DNS of your domain – an SPF record is a DNS TXT record that lists IPs authorized to send emails on behalf of your domain.

An SPF fail result indicates that the receiving mail server was unable to locate your SPF record in DNS and therefore couldn’t validate that the sending IP is legitimate. While this could be caused by unpublished SPF records or technical errors within them, most often it can be traced back to technical problems with your record itself; so using an SPF checker tool will highlight any discrepancies hindering the authentication process.

If your SPF record contains the -all mechanism, this tells other mail servers to accept all emails sent from your domain. This could allow threat actors a way to impersonate your brand name and send spam on its behalf as well as potentially hijack your domain for malicious use.

An SPF validation failure may also result from too many nested DNS lookups in an SPF record, with 10 being the limit; anything above this number will trigger its validation failure. You can test your record using several online tools that clearly display its number of nested lookups as well as identify syntax errors which could cause an SPF validation failure.


An SPF (Sender Policy Framework) record is a DNS TXT resource record that specifies which email servers are authorized to send emails on behalf of a domain. This helps protect against spam and other types of fraudulent email. If an email server that isn’t listed within your SPF record attempts to send an email on behalf of your domain, chances are high it will either be marked as spam or be rejected outright.

SPF records must include your actual email server to protect it from being misused by spammers and prevent them from sending emails on behalf of your domain from another IP address, thus protecting customers and keeping emails out of junk folders. Furthermore, it’s ideal to include the SMTP server where your website resides so that emails sent through contact forms or scripts pass the SPF test successfully.

If you use the include mechanism in your SPF record, it is important to be aware that every instance added represents a separate DNS lookup query and that too many lookups could cause it to fail a check. There are online tools available which can check and display the number of lookups performed automatically.

SPF errors are a frequent problem that can have serious repercussions for email deliverability. They may be caused by improper syntax or out-of-date information; even third-party DNS providers might cause these errors! Using appropriate tools and following best practices will help you prevent these errors from reoccurring.

SPF validation may fail for various reasons, including having too many SPF records, incorrect syntax or no SPF record present. When this occurs, a warning will appear alerting you that your records do not validate; use online tools to quickly locate and resolve this problem.


SPF (Sender Policy Framework) records are DNS TXT entries used to specify authorized IP addresses that may send emails on behalf of a domain name. When used alongside SMTP protocol, SPF ensures email is sent from one of the servers listed within its boundaries; any attempt at sending from unlisted servers would result in their emails being rejected as spam or rejected altogether. To prevent SPF failure it’s vital that regularly test your SPF record using free SPF tools such as MX Toolbox.

SPF errors often arise due to syntax issues or outdated information, leading to incorrect SPF records which cause your email delivery to fail. Therefore, it’s essential that before publishing an SPF record it be double-checked with an online tool by performing a lookup for issues within it.

An SPF error could occur if your MX mechanism or SPF record contains more than 10 address records, or your SPF record contains more than 10 INCLUDE mechanisms. This violates RFC 7208 which states that no MX mechanism should contain more than 10 A or AAAA records – any more will result in permanent error (rejection).

Another frequent SPF error can occur if your mail servers change without updating their SPF record, leading to emails being marked as spam because the sending server no longer matches any of the IP addresses in the record. You can solve this by reviewing your SPF record and removing any outdated entries, followed by running MX Toolbox tests to check for DNS errors.

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