If you use multiple email service providers, then flattening the SPF record every time is even harder and error-prone. Click the pencil icon next the record you want to edit. Click Mail Policies > Mail Flow Policy. So to avoid 'unreasonable load' on the validator, RFC7208 section 4. protection. eloqua. example. Inspect any domain's SPF record and learn how to fix it. I use Cloudflare for DNS for a domain that has a lot of different service providers who send email. Contact us via Email, Phone, or TicketSPF ships with a built-in limit to the number of “DNS-querying mechanisms” that a set of SPF records can contain. The more 3rd-party email sources you add to your domain, such as Marketing Automation, CRMs, Customer Support, and Order Fulfillment, you quickly max. Dynamic SPF Solutions. SPF flattening refers to the replacement of all the domains in your SPF record with their respective IP addresses. The SPF flattening works by removing the ‘a,’ ‘mx,’ and ‘include’ mechanisms to make a simplified SPF record and reduces the amount of DNS lookups. That limit is 10. This ensures that your record is short, crisp, and valid. MxDelivery Center analyzes your DMARC, DKIM and SPF to give you the insight you need to make email configuration changes and get your emails to your customer's. com ~all . Our solution compresses the number of DNS lookups in SPF records, which will improve the delivery rate of emails, allow for DMARC alignment and help with compliance. org is used for testing now. Their blog, MxToolbox: How to Enable SPF, DMARC, and DKIM, is a great guide for setting up SPF, DKIM and DMARC in a single outbound email sender Office 365 configuration. Varying. One good reason for this is that some email delivery services like HelpScout, Office. What is SPF record splitting? When a DNS TXT exceeds 255 characters, then it must be split into multiple strings. It provides a simple, intuitive system to help manage your complex SPF configurations. The SPF lookup limit wasn’t a problem when most companies operated their mail servers. The concept of SPF flattening is the opposite direction, e. Generate a valid and error-free SPF record. With an SPF record in place, Internet Service Providers can verify that a mail server is authorized to send email for a specific domain. Check IP addresses: If the SPF authentication fails for a specific IP address, verify that the IP address is authorized to send emails on behalf of the domain. • March 2, 2023 Ecosystem News Email Security Insights Inside dmarcian SPF Before taking the extraordinary steps of using SPF Flattening to work around SPF's built-in limits, use DMARC data and dmarcian's platform to. Semester at Sea recently hit the cap for spf text fields and needed a solution to flatten our records as well as monitor our email deliverability via dmarc. The SPF lookup analyzes registered TXT records in real time. Each time an email message hits the email service host, the host looks up in the DNS to perform SPF check. Television. This ensures that your SPF record is always less than that 10 DNS lookup limit to avoid hitting the SPF hard limit. Lets us know if you found this useful. SPF Flattening is a process of compressing an SPF record into sets of IP addresses. Staying within this limit is challenging and causes an SPF permerror, but AutoSPF’s SPF flattening service can save you. ABOUT EMAIL HEADERS. You can fix Permerror by deploying PowerSPF, an SPF Flattenin. Checks the existence of your published SPF record. You need to check echoworx's SPF record and determine where your mail is coming from, because it looks like they are the main offender when it comes to lookups, just their include alone is 5 lookups. com include:spf. Bonita Fierce is one of our favorite Latino-owned businesses, and NBC Select updates editor. Some basic SPF things to know: (SPF stands for Sender Policy Framework. With SPF delegation, your records are compressed, and sometimes even your email providers are hidden from mail transfer agents to prevent SPF lookup failure. SPF Delegation Frequently Asked Questions. It works by replacing all the domains in the SPF record with their IP addresses, which eliminates the need for multiple DNS lookups. 4 billion emails were sent and received each day in 2020, the figure is expected to increase to over 361. SPF Macros address this concern by effectively concealing authorized sources from cybercriminals. SPF validator. We flatten the SPF entries (so you stay under the 10/10 DNS lookups) under one include. The SPF lookup limitation isn’t hard to reach. Upgrade for Live Support. Additional Resource: [Blog] I’ve Got 99 Problems But SPF Ain’t One SPF flattening tool manages SPF delegation. “DNS lookups count “12” exceeds maximum limit of 10, which will result in a “permerror” and SPF authentication failure. Insight used for the above points can usually be found in your account's SPF survey tool. DMARC. Readme License. Anything else is rejected with a hard fail. com -all. This authorization is done by publishing a record in the DNS (Domain. For example, if you take google. Welcome to DMARC Advisors’ SPF Check: the best tool to verify your Sender Policy Framework record. DMARC, DKIM, and SPF are three email authentication methods. SPF is a DNS-based mechanism for defining a whitelist of mail servers that can send email on your domain’s behalf. Step 3: Update your DNS TXT Record for SPF at your domain provider (We will show examples with GoDaddy and Cloudflare) E. Overview. Our platform performs superior automatic flattening on your SPF record, instantly reducing your lookups. One of the “include” values causes 2 DNS lookups and only has a few IPv4 addresses in it, so would. Yes, the third party service Valimail does things programmatically like this, effectively giving each IP address a lookup in their. SPF flattening is not a one time task. Skip to main content. However, people were familiar with using TXT records, so having separate SPF records never replaced TXT records. SPF flattening isn’t a one-time deal; hence, you need an automated process; you must change your SPF. . When using SPF email authentication, each time an email is sent from a domain to the recipient’s domain, the recipient’s email server performs DNS query requests, also known as DNS lookups, to check for existing authorized IP addresses in your DNS and compare them to. It is very common for organizations, when constructing or modifying their SPF record, to run up against the 10 DNS lookup limit. Ecosystem News Email Security Insights Inside dmarcian. Guaranteed best prices of DMARC, SPF, BIMI, MTA-STS, TLS. ourDomainName. There are some obvious things we can do to reduce the number of lookups; e. 100% SPF Focus. We help fix a very specific technical email issue, we flatten SPF records that exceed the 10-lookup threshold. SPF record flattening is great. What we like: Our. if your SPF lookup exceeds 10, you could look at the number of recursions. For Enterprise users, SPF delegation is an optional add-on. Opensense Blog: SPF Flattening: The Secret To Boost Your Email Deliverability Products Integrations Pricing Resources Sign In Get a demo You've. Lookup List Here is a list of DNS lookups contributing to your count. This eliminates the need for DNS lookups. The DNS lookup is done directly against the domain's authoritative name server, so changes to DNS Records should show up instantly. GDPR COMPLIANT; DuoCircle LLC 5965 Village Way Suite 105-234 San Diego, CA 92130;SPF or Sender Policy Framework requires DNS records with the respective servers sending email listed. SPF record flattening If you search online you will find numerous tools that supposedly optimise your SPF records by flattening all include, a and mx terms into a single, large. This includes creating and updating these records. EasyDMARC is a comprehensive and easy-to-use tool that ensures organizations can manage their SPF, DKIM, and DMARC setup effectively. ️ Our platform. Fully scalable from SMB to enterprise with a budget-friendly price. RFC 4408 § 10. MxToolbox offers an SPF Flattening tool as part of our Delivery Center Plus plan. Wait for 24 hours (or more depending on your DNS provider) to activate the protocol. Fully scalable from SMB to enterprise with a budget-friendly price. SPF record flattening is a technique used to optimize SPF (Sender Policy Framework) records to overcome the 10 DNS lookup limit for SPF. DMARC Check. Therefore, you should use a flattened SPF record as a workaround. SPF is designed to help prevent spoofing, but there are spoofing techniques that SPF can't protect against. Just as fast as a regular SPF record will be updated. To run an SPF check, enter the domain in question, and it will fetch the SPF record (if any) from the DNS. The fastest path to enforcement. 11 hours ago · Bonita Fierce Coquito Candle. _netblocks. Forwarded email will change the return-path. When the hashsum of your IP Addresses changes, it will send out an email (or just dump HTML if it can't find an email server) with a handy diff & BIND format for viewing what has changed, and promptly updating it. DNS NS Record Lookup Tool – NS Record Lookup Online; DNS PTR Record Lookup Tool – PTR Record Lookup Online; DNS Record Checker Tools – Check DNS Records Instantly! DNS Record Lookup APIs: A, CNAME, MX, NS, PTR, SOA, TXT Record Retrieval APIs; DNS TXT Record Lookup Tool – TXT Record Lookup Online; Do you need DMARC if. We define our spf records once (with good comments), and select which records we want flattened out (it can be tricky to fit everything so that it fits in one record and is all under 10 records. google. ABOUT SPF RECORD CHECK. Whether you are an email novice, professional, marketer or technician, Delivery Center will help you get your message through. It is not. Simple enter your SPF record, click the Check SPF Record button, then scroll down to the Flattened SPF record section below to find the flattened SPF record. You can’t have more than one SPF record for a domain. Exceeding the SPF record length limit of 255 characters. Using an SPF fattening tool, on the other hand, allows you to scale. DMARC Record Check. Copy the value of the SPF record, and then choose Create record. A sender policy framework (SPF) record is a type of DNS TXT record that lists all the servers authorized to send emails from a particular domain. SPF errors are widespread because simple tasks like activating new email vendors can overflow and. All Tools; Dns Propagation Check. A domain can have no more than one SPF record. It's free to sign up and bid on jobs. Comments Here are some insights into your SPF record. Type: TXT. com SPF record in their domain SPF records. Sender Policy Framework (SPF) has certain. You will need to add the missing senders to your SPF record or use an SPF Flattening tool. Verified Sources should be in your SPF records, meaning they should be Authenticated. somesite. The SPF record exceeds the 10 DNS query limit, which results in deteriorated email deliverability. Drag & drop your file into our PDF to JPG tool. DMARCian emphasized that it’s crucial to adopt a more secure email authentication method like DKIM or DMARC, which eliminates the need for SPF flattening altogether. r53spflat is an extension to sender-policy-flattener which is a different project maintaind by centanu. eloqua. It is a process of compressing an SPF record into sets of IP addresses. These solutions can be varied in implementation, but they typically all present the same benefits. The Sender Policy Framework (SPF) is an email authentication protocol designed to prevent email spoofing, a common technique used in phishing attacks and email spam. 141The SPF (Sender Policy Framework) redirect is a record modifier that points to a separate domain name containing an SPF record. com include:spf1. SPF record flattening. v=spf1 include:emsd1. The receiving server will issue up to 10 DNS lookups to. SPF Flattening. Something like. Optionally, you can specify an IP address to check if it is authorized to send e-mail on behalf of the domain. The MX lookup is done directly against the domain's authoritative name server, so changes to MX Records should show up instantly. net. Each Manual flattening basically means evaluating your desired SPF record converting all the hostnames into IP addresses along the way. com to refer directly to the thirdparty SPF records; thus removing 2 from our count. Use our free tool to validate your SPF record in seconds. This option allows you to determine which standard of SPF or SIDF verification to use. Sender Policy Framework (SPF) is an email authentication protocol that can be used to prevent spammers and attackers from sending messages that appear to come from a trusted domain. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright. DMARC or ‘Domain-based Message Authentication, Reporting, and Conformance’ is the umbrella mechanism forming the basis of authentication checks like SPF and DKIM. com to send emails on behalf of a domain. As you add more third-party email sources, such as CRMs, Marketing Automation, Customer Support, Order Fulfillment, and other tools to your domain, you quickly max out of the allotted SPF configuration options. Contact us via Email, Phone, or TicketAn SPF policy is a list of mail servers authorized to send messages on behalf of your domain. include:, a:, mx:, exists:. With the possibility of your ESP's IP changing anytime, it's not worth the effort. The increasingly widespread use of SaaS email service providers such as Exchange Online, G-Suite, Amazon SES, SendGrid and others is a challenge for email administrators. The increasingly widespread use of SaaS email service providers such as Exchange Online, G-Suite, Amazon SES, SendGrid and others is a challenge for email administrators. It makes the distinction between a DMARC domain and an SPF domain which delivers the correct SPF entries at the right place in your DNS. Click Default Policy Parameters. Our customers see a 6-8 week average time to full DMARC enforcement (p=reject or p=quarantine). com's IP addresses directly into your domain's SPF record to "flatten it", however then you need to manually keep up with appriver's changes. Automatic/dynamic SPF record flattening. For Routing policy, choose Simple routing. Sports. Here to help you. 0: payfast. Automatic flattening all domains in the include. Methods for flattening. Flattening simply substitutes all domains in the SPF record for their IP addresses, eliminating the need for DNS search. Here is an example SPF record: v=spf1 include:_spf. Phone: 1 778 265 0114 Mail: info@timberstonetools. After completing these steps, if you’re going to be sending out emails under the same domain name, it’s always a good idea to test your emails before. This tool can flatten SPF records for free for you. While the limit is extremely easy to exceed when you use multiple vendors to send your emails, staying under the limit is just as easy with an auto SPF flattening tool. Demystifying SPF Macros. Flatten your SPF records manually (NOT RECOMMENDED) SPF flattening is the process of converting an SPF record into a format that contains fewer than 10 DNS lookups. Select the domain you want to manage and click the DNS Zone File tab. script to expand/flatten SPF records Resources. • February 24, 2023 Email Security Insights Technical Guidance SPF Related Posts SPF Surveyor: See your SPF Record Activity With a complicated and bloated SPF record,. This limitation restricts the number of DNS lookups that can be performed when an SPF record is evaluated. edgerc (based on Akamai instructions ). With this tool you can inspect and validate your SPF DNS record. It does not look right at all. The project is opensource; It will query your list of approved sendors and flatten these into a list of appropriately formatted and sized spf records composed of ip4 and ip6 spf entries. 1. MxToolbox offers an SPF Flattening tool as part of our Delivery Center Plus plan. Use our DMARC checker to see if a domain has a valid policy. SPF record flattening can be an easy answer, but is not the. For Record name, specify a name. If you want to modify an existing SPF Record from a domain, please look for the domain in question. When first implementing an SPF, the network’s authority should always use spf1, the most frequently used SPF between email interactions. Tools. 1. The more 3rd-party email sources you add to your domain, such as Marketing Automation, CRMs, Customer Support, and Order Fulfillment, you quickly max. 3. 4 states that evaluation of an SPF policy may not exceed 10 terms that require DNS lookups. It could be caused by various reasons, such as syntax errors, exceeding the SPF record limit, or incorrect DNS configuration. If you still want to manually flatten, here's one flattened below to about 8 lookups, with one caveat. In an attempt to reduce the number of DNS lookups occurring against our DNS SPF record I have written a PowerShell script which will extract out all of the allowed IP addresses from a SPF netblock (i. SPF flattening er processen med at konvertere en SPF-record til et format, der indeholder færre end 10 DNS-opslag. Dmarcian indicates that their "SPF Surveyor" was the first tool to help address this problem by reading your existing SPF record, and providing a new, smaller, "flattened" SPF record in response, to reduce the number of DNS lookups needed to fully process the record, to get around the "10 DNS lookup" limit inherent to the SPF specification. org The service has DNS code to get that request - in the backend lookup example. I think the correct answer is: v=spf1 +a +mx include: spf. zwagerman December 1, 2021, 3:34pm 1. An SPF record starts with v=, telling the readers and the DNS which version of the SPF is being used. If you click on the next tab called “SPF record generator,” it will allow you to generate your SPF record. Each time they replace a modifier, the SPF. com. As part of MxToolbox Delivery Center, we automatically detect the sources that are sending email on behalf of your domain. GlockApps has the built-in tool called SPF Flattener which automates SPF record flattening. SPF Manager treats the SPF open standard as defined by the RFC. Make sure you remove redundant, repeated, and NULL mechanisms within your SPF record which also adds to the character limit. Helps in always maintain the 10 DNS lookup limit. • March 2, 2023. Ever since Gmail anounced they’d go stict against senders that don’t have SPF set up properly, we’ve been adding all our email sending services to our SPF DNS record. Finally another option is to modify your SPF records through a method known as 'SPF Flattening', which reduces the number of SPF mechanisms. Email has security standards to control which senders are allowed to send email for your domain. The end result is a simple SPF record for google. Mailhardener helps you secure and monitor your domain from being used for fraud and spam. Select DNS to view your DNS records. If you’re into commercial email marketing, you. Optimizing your SPF Record. I have created a python script that generates config files for DNS server rbldnsd. It could also mean more complex management through the use of macros. Otherwise, the existence of any of these techniques will. You could do this manually, but then you have to update your SPF records every time one of the providers changes their IPs (which happens frequently). It provides a simple, intuitive system to help manage your complex SPF configurations. Then those records contain IP values that used to be part of the main SPF record. Check for multiple SPF records. ABOUT SPF RECORD CHECK. Award winning e-mail security and monitoring software for Microsoft Exchange and IIS. I noticed today that my SPF record has been distributed so the main record contains includes like _spfcf1, _spfcf2 etc. 3. If your record for SPF is exceeding the lookup limit after including all vendors, flatten it with our auto SPF flattening tool. DKIM and SPF can be compared to a business license or a doctor's medical degree displayed on the wall of an office — they help demonstrate. ) Cloudflare - Free for the time being,. com" domain, and use AutoSPF to "flatten" its various records. These tools are meant to help you deploy SPF records for your domain. An SPF flattening tool reduces the instances of errors by compressing all authorized sources into a single, comprehensive, inclusive, yet simplified record that takes care of misconfigurations. It is therefore wise to loop through your SPF once in a while, to. This test will lookup an SPF record for the queried domain name, display the SPF Record (if found), and run a series of diagnostic tests (SPF Validation) against the record, highlighting any errors. Loads flattened SPF records from AutoSPF's API and inserts them into a PowerDNS zone via the PowerDNS API. em. You can use this tool to see if your records have propagated across all your servers, as well as identify possible DNS issues. Use this tab to create an SPF record. In order to promptly modify your SPF record you can use the following SPF best practices: Try typing down your email sources in decreasing order of importance from left to right in your SPF record. org. ourDomainName. The 10 DNS lookup limit is a restriction imposed by many DNS resolvers, which limits the number of DNS queries that. edgerc file should be placed in the project root directory and should have the following format:Here’s how the SPF include mechanism works: The domain owner publishes an SPF record. With the tool open, go to the 'Test SPF Record' section. How to Flatten SPF Records. Inspect any domain's SPF record and learn how to fix it. In practical terms, this means that if your SPF record includes too many "include" mechanisms, "a. When merging multiple SPF records, you can use v=spf1 only once in the beginning and all only once at the end. I have an SPF record that has too many DNS lookups. By listing all the sending sources authorized to send email from your domain, you can block email spoofing attempts from outsiders. Your SPF record is inaccurate. There could be bug with multiple nested or flattened SPF records, which we are working on currently. com. Looking at the Audit Log area these records were created on April 17th and 18th by a. outlook. If you have any queries. Managed Services. This standard is all about e-mail security. Use an Automatic SPF Flattening Tool. Use an automated service that flattened the record and then keeps it updated. SPF Flattening. 6. The SPF Surveyor is an SPF diagnostic tool that presents a graphical view of SPF records. ; Email Email us with your customer support inquiry. This tool can help you generate a SPF Record or modify your current SPF Record as well as to check the modified record has the correct syntax. No charge for phishing attacks, or invalid mails sent on your behalf. This test will check the propagation of DNS records across your servers for the selected DNS record type. How To Flatten a PDF File Online for Free. Sender Policy Framework, more commonly known as SPF, is an email authentication standard that allows a domain owner to authorize the use of its domain in email messages, with such authorization tied to the physical source of the message. Domain-based Message Authentication, Reporting & Conformance gives unprecedented insight into your organization’s email flow. Signup for FREE Bulk Lookup. SPF macros are character sequences that can be used to simplify your SPF record configuration by replacing mechanisms defined within the said SPF DNS TXT record, as explained under RFC 7208, section 7. (Note that in manual mode, no DNS changes are made or served, meaning the tool is only used for flattening, and effecting change depends on the domain's DNS administrator - This is why we can use amazon. 3. Rather than SPF flattening being a feature of a larger and more expensive suite of software we have designed AutoSPF to solve just one issue. About ORF. Help on SPF record checker. com) Import DNS SPF record into system. As part of MxToolbox Delivery Center, we automatically detect the sources that are sending email on behalf of your domain. This tool can flatten SPF records for free for you. com aren't really adding any value; so we can just drop those records and update example. お客様のSPFレコードで更新されていないESPのIPアドレスが変更または. Prior to creating an SPF specific subdomain, try to use CIDR notation for IP ranges in order to reduce the length of your SPF record under the 255 character limit. It provides a simple, intuitive system to help manage your complex SPF configurations. If you don't know your mail server's address, start with a MX Lookup. SPF flattening exists to clean up the SPF record and bring the DNS lookup under 10. SPF specification has a limit on the number of DNS lookups (10) required to fully resolve an SPF record. The SPF checker calculates the number of DNS lookups in your SPF record, and warns you if your record exceeds that limit. Sender Policy Framework, ou SPF, é um protocolo de autenticação de correio electrónico amplamente aclamado que valida as suas mensagens, autenticando-as contra todos os endereços IP autorizados registados para o seu domínio no seu registo SPF. SPF. v=spf1 include:_spf. Put the most important 10 lookups in the SPF record and rely on DKIM for the rest for DMARC. This tool can help you generate a SPF Record or modify your current SPF Record as well as to check the modified record has. DKIM . Hi Guys, Would like to know if also other people would be interested in flattening of a SPF record. Higher compliance rates. Provide these entries as a chain of spf include entries. com ~all . Add SPF record Office 365. What does the Folderly testing tool cover with regards to SPF? Take more attention While roughly 306. The advantage of a fully-automated SPF Flattening service is the low-maintenance. 108. outlook. Using the SPF email protocol, an organization can publish a list of authorized mail servers in an SPF record that appears in its DNS record. Sure. ABOUT SPF RECORD CHECK. DNS record splitter. Organizations such as PowerDMARC have developed tools that enable automatic SPF flattening. SPF records only permit 10 ‘lookups’ to lessen the strain on the email receivers’ side and issues with SPF modifications. Looking at the Audit Log area these records were created on April 17th and 18th by a. You won't know if they make a change until you possibly start having bounces. secureserver. Put the most important 10 lookups in the SPF record and rely on DKIM for the rest for DMARC. Stars. This includes creating and updating these records. Similarly, it also notifies you when there is no valid SPF. The tool will show the number of DNS querying mechanisms used in the SPF record for your domain. Creating additional SPF records for subdomains. We currently have 12, and so would like to reduce it to the recommended maximum of 10. Change sources order. For the most part, our advice for th. 1. Click Test SPF Record. Scaling a company involves a continual to and fro of emails, which can impede SPF deployment, especially for new domains. google. The project is opensource; It will query your list of approved sendors and flatten these into a list of appropriately formatted and sized spf records composed of ip4 and ip6 spf entries. Each SPF record is kept to less than 512 bytes to fit into a single UDP packet (assuming no other TXT records are sharing the DNS label). 0 license How can I include another SPF record if my existing domain already has 10 lines of SPF records in the TXT record? I wanted to add these two: include:mailgun. ”. Your SPF records will be constantly. Create a new TXT Record. To run an SPF check, enter the domain in question, and it will fetch the SPF record (if any) from the DNS. Domain owners can configure multiple domains to make use of a single SPF record hosted on one domain using SPF redirect. It addresses the challenge of the “10-DNS-Lookup” limit by dynamically flattening SPF records into a single, consolidated record. Learn below why it is so. If you don't, you probably don't need one yet. MxToolbox offers an SPF Flattening tool as part of our Delivery Center Plus plan. Some DNS service providers require you to split long TXT resource records into 255 characters parts. 4. The best way to bypass the 10 DNS lookup limit is to flatten DNS records and provide the domain IP address directly. Contact us via Email, Phone, or TicketSplitting a long SPF TXT record When to split your DNS record vs flatten it. Set the type to TXT and enter your SPF record in the right column (substitute your server’s IP address. Also, you can reduce the number of DNS-querying mechanisms/modifiers to 1 by using a flattened SPF record. Whether you are an email novice, professional, marketer or technician, Delivery Center will help you get your message through. According to Section 10. greg. Free DMARC Tools. 2. SPF flattening isn’t a one-time deal; hence, you need an automated process; you must change your SPF. SPF flattening came about to be a solution a very specific problem: That a lot of senders utilize multiple service providers, utilizing business email platforms like Outlook. Since DMARC relies on SPF. In the SPF/SIDF Verification section, click Yes. Name: The hostname or prefix of the record, without the domain name. It provides a simple, intuitive system to help manage your complex SPF configurations. Use an Automatic SPF Flattening Tool. com -all This record allows any host with an IP address specified in the SPF record of _spf. You can use free online SPF tools for various tasks including generating an SPF record and checking an existing SPF record. This announcement comes as part of the industry’s shift towards better email authentication practices in the aftermath of several high-profile phishing attacks targeting. When you add a new mechanism in your record, you require a new DNS lookup. Under the Records section, select SPF. outlook. com include:_spf. The SPF record checker, aka SPF record validator/tester, checks if an SPF record is published on a domain, and if the SPF record's syntax is correct. org include:sendgrid. com that does not exceed 255 characters. If a record contains too many DNS lookups, it may do more harm that good.