SPF Record Lookup
With Zoho Toolkit’s SPF record lookup tool, you can instantly retrieve and verify the SPF records for any domain and confirm your email authentication setup without any technical configuration required.
What is an SPF record?
SPF, or Sender Policy Framework, is a type of DNS record that lists all of the domains and IP addresses authorized to send emails on behalf of a particular domain. It acts as a gatekeeper, allowing only authenticated sources to send emails from that domain. By defining authorized senders in the SPF record, domain owners can protect their brand reputation and ensure that their emails are delivered securely.
How SPF lookup works
When an email is received, the recipient’s mail server checks whether the sender’s IP address is listed as an authorized source in the domain’s SPF record. If it passes, the email proceeds to delivery. If it fails, the outcome depends on the qualifier defined in the record. The email may be soft-failed, rejected, or passed through with a warning.
SPF alone doesn’t always identify the exact reason an email fails delivery. The sending IP may be valid but unlisted, the email may be a forwarded message, or it may be fraudulent. In these cases, DKIM and DMARC records provide the additional context needed to determine the correct course of action.
Components of the SPF record lookup
There are some rules to be followed when it comes to defining SPF records. There can be only one SPF record associated with the domain, and uppercase characters cannot be used when defining the record. Here’s a sample SPF record:
v=spf1 ip4:192.0.1.0 ip4:192.0.0.1 include:test.email -all
v=spf - Defines that the record is a SPF type.
This is followed by a list of IP addresses that are authorized to send emails. Third-party services involved in email sending can also be referenced using the include tag.
+all: Defines all of the servers that are allowed to send an email.
~all: Servers defined under this record will have emails received, but marked as spam.
-all: Servers listed under this record will be rejected directly.
Why should you perform an SPF record lookup?
Running a regular SPF record check helps confirm that your domain’s email authentication is properly configured. Syntax errors, missing entries, or exceeding the 10 DNS lookup limit can cause legitimate emails to fail delivery without obvious warning. Email administrators use SPF lookups after DNS changes, when onboarding a new email service, or when investigating deliverability issues. Security teams also use SPF lookups to verify whether a sender was legitimately authorized when reviewing phishing or spoofing reports.
Why should you choose Zoho’s SPF lookup tool?
Zoho’s SPF lookup tool queries your domain’s DNS directly and validates the returned record against RFC 7208 standards. It checks for syntax errors, counts DNS lookups, flags unsupported mechanisms, and identifies configuration issues that could cause SPF failures.
No registration is required to use the tool. As part of the Zoho Toolkit, the SPF checker works alongside the DKIM checker, DMARC analyser, DNS lookup, and other domain management tools, so you can review all of the relevant authentication records from one place.
How to use our SPF lookup tool
Retrieving and analyzing your domain’s SPF configuration takes just a few seconds and requires nothing but your domain name. Follow these steps:
- Enter your domain: Type your domain name into the search field.
- Run the query: Click the blue Lookup button to ping your domain’s DNS records.
- Review the results: Instantly view your SPF TXT entry, which includes the raw record, a parsed breakdown of each mechanism, its validation status, and a clear list of any detected issues.
- Security and incident response: To investigate phishing attempts by determining whether a suspicious email originated from an authorized IP address.
What information appears in SPF results?
An SPF lookup returns the TXT record as published in DNS, along with a structured breakdown of its components. You can see which IP addresses and domains are authorized to send on your behalf, the qualifier applied to each mechanism, and the final catch-all directive.
The tool also flags common problems such as duplicate SPF records, mechanisms that push lookups past the allowed limit, and the use of deprecated tags like “ptr”. Results include both a validation status and specific details about each issue detected.
Practical applications of SPF lookup
IT, email, and security teams rely on SPF lookups to maintain email deliverability and protect domain integrity. Here are the most common use cases:
- Initial domain setup: To confirm that the SPF record is correctly published and completely free of syntax errors.
- Integrating third-party services: To verify that adding a new sender (via an include tag) doesn’t push the configuration past the strict 10 DNS lookup limit.
- Post-update verification: To ensure that recent DNS modifications have successfully propagated and the record remains valid.
- Security and incident response: To investigate phishing attempts by determining whether a suspicious email originated from an authorized IP address.
Frequently Asked Questions
What is an SPF record, and what does it look like?
An SPF (Sender Policy Framework) record is a DNS TXT record that defines which mail servers can send emails for your domain. It helps prevent email spoofing.
Example:
v=spf1 ip4:192.168.0.1 include:_spf.google.com ~all
- v=spf1 identifies the record as SPF
- ip4 authorizes a specific IP address
- include authorizes third-party mail servers
- ~all marks unauthorized senders as soft fail
What’s the difference between SPF, DKIM, and DMARC?
SPF, DKIM, and DMARC are email authentication protocols that work together to prevent spoofing.
- SPF verifies if the sending server is authorized to send emails for the domain
- DKIM verifies the email content using a digital signature
- DMARC tells receiving servers how to handle emails that fail SPF or DKIM checks and provides reporting
Using all three improves email security and deliverability.
Why should you set an SPF record?
There are two primary reasons: preventing spoofing and protecting deliverability.
Without an SPF record, anyone can send email using your domain name. Fraudsters exploit this to impersonate businesses in phishing campaigns. An SPF record restricts which servers are permitted to send on your behalf, making unauthorized use easier to detect and block.
An SPF record helps prevent email spoofing and improves email deliverability. It authorizes trusted mail servers to send emails for your domain, making phishing attempts easier to detect. It also helps mailbox providers identify legitimate emails, reducing the chances of messages being marked as spam or rejected.
What’s the correct SPF record format for email authentication?
A valid SPF record is a DNS TXT record that starts with v=spf1 and defines authorized email senders. For example:
v=spf1 ip4:[IP] include:[domain] -all
- ip4 or ip6 authorizes specific IPs
- include authorizes third-party services
- -all rejects unauthorized senders
Avoid +all, as it allows any server to send emails for your domain.
Can a domain have more than one SPF record?
No. A domain can have only one SPF record. Multiple SPF records cause a PermError and SPF authentication fails.
To authorize multiple email services, combine them into one record: v=spf1 include:_spf.zoho.com include:_spf.google.com -all
Why should I check my domain's SPF configuration?
Checking your SPF configuration ensures your email authentication stays accurate and reliable.
It helps verify that authorized sending services are included, unauthorized changes haven’t been made, the record stays within SPF lookup limits, and the syntax is valid. Even small errors can impact email deliverability and authentication.
How do I check my SPF record via command line using dig?
Use the dig command to query your domain’s SPF TXT record directly.
Run: dig txt yourdomain.com +short
If configured, the output will include a record starting with v=spf1. No output means no SPF record exists.
To check using a public DNS resolver:
dig @8.8.8.8 txt yourdomain.com +short
This helps verify DNS propagation and external visibility.
What does it mean if my domain has too many DNS lookups?
Too many DNS lookups means your SPF record exceeds the 10-lookup limit defined by SPF standards. When this happens, SPF validation fails with a PermError.
This is usually caused by multiple include, mx, or a mechanisms. The fix is SPF flattening, which replaces nested lookups with direct IP addresses to reduce DNS queries.
What is a void lookup, and why is it a concern for SPF configuration?
A void lookup happens when an SPF DNS query returns no result or a non-existent domain. SPF allows a maximum of two void lookups. Exceeding this limit causes SPF validation to fail with a PermError.
Void lookups are usually caused by invalid or outdated include entries. Regular SPF validation helps identify and fix these issues before they affect email delivery.
How can I fix syntax errors in my SPF record?
Common SPF syntax fixes include:
- Keep only one SPF TXT record
- Start the record with v=spf1
- Use valid qualifiers like -all or ~all
- Remove deprecated mechanisms like ptr
- Reduce excessive include lookups
After updating the record, run an SPF checker to validate the syntax and configuration.
How do I troubleshoot an SPF PermError or TempError?
A PermError means the SPF record has a configuration issue, such as multiple SPF records, syntax errors, or too many DNS lookups.
A TempError indicates a temporary DNS resolution issue, usually caused by DNS server or network problems.
Use an SPF checker or run dig txt yourdomain.com to identify and troubleshoot the issue.