{"id":57803,"date":"2026-01-20T12:47:45","date_gmt":"2026-01-20T12:47:45","guid":{"rendered":"https:\/\/easydmarc.com\/blog\/?p=57803"},"modified":"2026-01-22T12:48:31","modified_gmt":"2026-01-22T12:48:31","slug":"spf-too-many-dns-lookups-how-to-fix-it","status":"publish","type":"post","link":"https:\/\/easydmarc.com\/blog\/spf-too-many-dns-lookups-how-to-fix-it\/","title":{"rendered":"SPF Too Many DNS Lookups: How to Fix It?"},"content":{"rendered":"\n

When you send an email, the receiving mail server needs a way to check if it really came from your domain. That is where SPF comes in. <\/p>\n\n\n\n

But sometimes, things get messy, and you may see an error called SPF too many DNS lookups. This happens when your SPF record asks the server to check more DNS information than allowed. The limit is 10 lookups, and it exists to keep email systems fast and safe. Once your SPF record crosses that limit, mail services may stop trusting your messages. They might send them to spam or block them completely. <\/p>\n\n\n\n

If you use many email tools for marketing, support, or billing, this problem can appear without you even noticing. In this guide, you will learn why it happens and how to fix it.<\/p>\n\n\n\n

What Does \u2018SPF Too Many DNS Lookups\u2019 Mean<\/strong><\/h2>\n\n\n\n

As per RFC 7208<\/a>, there can not be more than 10 DNS lookups per SPF record. The error \u2018SPF too many DNS lookups\u2019 means your SPF record is trying to check more than 10 DNS entries when an email is verified.\u00a0<\/p>\n\n\n\n

SPF works by confirming which servers are allowed to send emails for your domain. To do this, it looks up DNS information linked to mechanisms like include, a, mx, and exists. Each of these can trigger one or more DNS queries. If the total number goes beyond 10, the receiving mail server stops checking and treats your SPF record as invalid. <\/p>\n\n\n\n

This error can cause your emails to fail authentication and land in spam or get blocked. The problem usually occurs when you add many email services, and each of them adds extra lookup requirements in your SPF record.<\/p>\n\n\n\n

Sometimes the limit is crossed without you noticing, which makes the problem harder to detect. So, it\u2019s suggested that you regularly run your SPF record through an SPF record lookup tool<\/a>.<\/p>\n\n\n\n

Why SPF Has a 10 DNS Lookup Limit<\/strong><\/h2>\n\n\n\n

Here are three reasons why RFC has imposed the SPF record too many DNS lookups limit in the first place-<\/p>\n\n\n\n

1. Reduce the Load on the DNS Server<\/strong><\/h3>\n\n\n\n

Every lookup asks a DNS resolver to search for records and return the data. This puts a load on the DNS server. So, if a single SPF record triggers a large chain of queries, it puts pressure on DNS systems and slows responses for everyone. That\u2019s why, by limiting SPF to 10 lookups, the DNS traffic becomes predictable.<\/p>\n\n\n\n

2. Prevents Delays in Email Deliveries<\/strong><\/h3>\n\n\n\n

Too many DNS lookups increase the time it takes to verify an email. Mail servers have to wait for each lookup before deciding if a message is safe. With the imposition of the limit, the latency is reduced, which ultimately helps emails move faster through filters. This way, messages don\u2019t get stuck or rejected.<\/p>\n\n\n\n

3. Protects Against Security Risks<\/strong><\/h3>\n\n\n\n
    <\/ol>\n\n\n\n

    If there is no limit, attackers could create SPF records that force many DNS requests and slow down or crash mail systems. But with the presence of the limit, their tactics are blocked, helping domain owners avoid DDoS attacks.<\/p>\n\n\n\n

    Reasons For \u2018SPF Too Many DNS Lookups\u2019 Error<\/strong><\/h2>\n\n\n\n

    Usually the reasons for this error are well within the control of the person in charge of maintaining the SPF record. Let\u2019s see the possible reasons first and then know how can you fix them.<\/p>\n\n\n\n

    Complex SPF Records<\/strong><\/h3>\n\n\n\n

    One of the common things triggering this error is an over-crowded SPF record. Whenever you use mechanisms like include, a, mx, ptr, and exists, each instance of their occurrence gets counted towards the DNS limit. So, as your SPF record grows, a  point comes when the SPF record requires too many DNS lookups for a complete evaluation. <\/p>\n\n\n\n

    Too Many \u2018include\u2019 Statements<\/strong><\/h3>\n\n\n\n

    The SPF record too many DNS lookups problem often appears when there are too many \u2018include\u2019 statements. Each \u2018include\u2019 pulls in another SPF record, which can also contain more \u2018include,\u2019 \u2018a,\u2019 and \u2018mx\u2019 mechanisms. This creates a chain of DNS queries. <\/p>\n\n\n\n

    If every included record is large or badly managed, the combined SPF policy quickly reaches the 10 lookup cap. This is all the more possible when you have included multiple third-party service providers that send emails on your behalf.<\/p>\n\n\n\n

    Extra Domains and Fragmented Policies<\/strong><\/h3>\n\n\n\n

    If your organization owns multiple domains and subdomains, and has created individual SPF records for each, then too many DNS lookups are inevitable. In some cases, email forwarding or alias setups can cause a single message to trigger SPF checks on multiple domains. This results in adding more DNS activities, increasing the risk of an SPF record requiring too many DNS lookups.<\/p>\n\n\n\n

    How to Check SPF for Too Many DNS Lookups<\/strong><\/h2>\n\n\n\n

    Finding out whether your SPF record has exceeded the 10 DNS lookup limit is not as mysterious as it sounds. Here are simple ways to check it:<\/p>\n\n\n\n

    1. Use an Online SPF Lookup Checker<\/strong><\/h3>\n\n\n\n

    An SPF lookup tool can count all DNS lookups in your SPF record and tell you if it hits the dreaded \u2018SPF record requires too many DNS lookups limit\u2019 error. It breaks down mechanisms like include, a, mx, and nested records, so you see exactly where the lookups are coming from.<\/p>\n\n\n\n

    2. Count Lookups Manually<\/strong><\/h3>\n\n\n\n

    Start with your main SPF record, count lookup mechanisms (include, a, mx, exists, and ptr), then open every included SPF record and repeat. If the total goes beyond 10, you have a \u2018too many DNS lookups\u2019 issue.<\/p>\n\n\n\n

    3. Check Your DMARC Reports<\/strong><\/h3>\n\n\n\n

    If your SPF is already failing, DMARC reports may show a Permerror for SPF. This often happens when the lookup limit is crossed. So if you see Permerror often, it is a clue that your SPF record needs fixing.<\/p>\n\n\n\n

    You can use DMARC XML Report Analyzer<\/a> to convert the report data into easy-to-understand format.<\/p>\n\n\n\n

    How to Fix the \u2018SPF Too Many DNS Lookups\u2019 Error<\/strong><\/h2>\n\n\n\n

    Here is how to fix SPF too many DNS lookups by making your SPF record lighter and easier to evaluate. <\/p>\n\n\n\n