Advanced
What Is an SPF Void Lookup and How Can You Fix It?
Learn what an SPF void lookup is, why it occurs, how it affects email authentication, and practical ways to identify and fix SPF void lookup issues.
Advanced
Enterprise-grade email authentication strategies. Deep dives on SPF macros, DMARC enforcement, complex multi-domain configurations, compliance requirements, and security architecture.
93 articles
Advanced
SubdoMailing Explained: How Subdomain Hijacking Enables Email Spoofing
Learn how SubdoMailing exploits subdomain hijacking to enable email spoofing, bypass authentication controls, and create serious email security risks.
Advanced
DMARC RFC 7489 Explained: The Standard Behind Email Authentication
Learn how DMARC RFC 7489 defines email authentication, SPF and DKIM alignment, policies, reporting, enforcement, and best practices for domain protection.
Advanced
How Does Microsoft 365 Perform SPF Evaluation for Incoming Email?
Learn how Microsoft 365 performs SPF evaluation for incoming email, checks sender authorization, and uses SPF results to help detect spoofing and email threats.
Advanced
Does SPF Hard Fail Reject Forwarded Emails? What Actually Happens
SPF hard fail can affect forwarded emails. Learn what happens during forwarding, why SPF may fail, and how DMARC and SRS help prevent rejection.
Advanced
NetSolutions Blackbaud SPF Setup: How to Configure SPF for Blackbaud
Configure NetSolutions Blackbaud SPF correctly with this step-by-step guide to improve email authentication, deliverability, and domain security.
Advanced
Email Salting Attacks: How Hidden Text Can Bypass Email Security Filters
Discover how email salting attacks use hidden text, Unicode, and CSS tricks to bypass email security filters—and learn effective detection strategies.
Advanced
DMARC Deployment Phases: How to Prepare for a Smooth DMARC Rollout
Learn the 5 DMARC deployment phases to configure SPF, DKIM, monitor reports, and enforce DMARC policies for stronger email security and delivery.
Advanced
Why Does My SPF Record Pass Validation But Still Fail Authentication?
Learn why your SPF record can pass validation but still fail authentication. Discover common causes, troubleshooting steps, and how to fix SPF failures.
Advanced
How Does An SPF Record Generator Prevent SPF Policy Drift?
Prevent SPF policy drift with AutoSPF. Learn how automation, validation, CI/CD, lookup management, and continuous monitoring keep SPF records accurate.
Advanced
What Risks Should I Be Aware Of When Manually Updating My SPF Record Using Kitterman?
Avoid common SPF update mistakes with Kitterman. Learn the risks, fix lookup limits, prevent errors, and improve email deliverability with best practices.
Advanced
WHOIS Verification and ICANN Requirements: Why Accurate Domain Ownership Matters for SPF, DKIM, and DMARC
Keep your WHOIS details accurate to meet ICANN rules and protect email authentication. Reliable domain ownership supports SPF, DKIM, and DMARC security.
Advanced
How to Configure DKIM for IONOS
Learn how to configure DKIM for IONOS to improve email authentication, boost deliverability, and protect your domain from email spoofing.
Advanced 17 min
Does Cyber Insurance Require DMARC? (2026 Guide)
Underwriters now price DMARC and email authentication into cyber insurance. See how your SPF, DKIM, and DMARC posture affects premiums in 2026.
Advanced 12 min
Advanced SPF Validation Tips To Eliminate Permerror And Lookup Issues
To eliminate SPF permerror and lookup issues, automatically validate SPF syntax.
Advanced 12 min
Fortgeschrittene Tipps zur SPF-Validierung, um Permerror und Lookup-Probleme zu beseitigen
Um SPF-Permerror und Lookup-Probleme zu beseitigen, validieren Sie die SPF-Syntax automatisch.
Advanced 12 min
Consejos Avanzados De Validación De SPF Para Eliminar Los Permerror Y Los Problemas De Búsqueda
Para eliminar el permerror de SPF y los problemas de búsqueda, valide automáticamente la sintaxis de SPF.
Advanced 12 min
Conseils avancés de validation SPF pour éliminer les PermError et les problèmes de lookups
Pour éliminer les PermError SPF et les problèmes de lookups, validez automatiquement la syntaxe SPF.
Advanced 12 min
Consigli avanzati per la validazione SPF: eliminare i permerror e i problemi di lookup
Per eliminare i permerror SPF e i problemi di lookup, convalidi automaticamente la sintassi SPF.
Advanced 12 min
PermErrorとルックアップの問題を解消するための高度なSPF検証のヒント
SPFのpermerrorとルックアップの問題を解消するには、SPF構文を自動的に検証しましょう。
Advanced 12 min
Geavanceerde SPF-validatietips Om Permerror En Lookup-problemen Te Elimineren
Om SPF-permerror en lookup-problemen te elimineren, valideert u de SPF-syntaxis automatisch.
Advanced 12 min
Zaawansowane Wskazówki Dotyczące Walidacji SPF, Aby Wyeliminować Permerror i Problemy z Zapytaniami
Aby wyeliminować permerror SPF i problemy z zapytaniami, należy automatycznie walidować składnię SPF.
Advanced 12 min
Dicas Avançadas de Validação de SPF Para Eliminar Permerror e Problemas de Consultas
Para eliminar o permerror de SPF e os problemas de consultas, valide automaticamente a sintaxe do SPF.
Advanced 17 min
AI-Powered Phishing in 2026: How Generative AI Changed the Attacker Economics of Email Why Email Authentication Is the Last Reliable Defense Signal in the Age of AI
- 80%+ of social engineering is now AI-supported, up from negligible levels three years ago.
Advanced 23 min
Best Email Authentication Tools For Enterprise in 2026 The Complete Guide
Email authentication is the process of verifying that an email message was actually sent by the domain it claims to come from.
Advanced 24 min
Best DNS Security Tools for Email in 2026 SPF, DKIM & DMARC Management Compared
What Is DNS-Based Email Security? DNS-based email security is the practice of using Domain Name System records to authenticate outgoing email, enforce poli
Advanced 30 min
Best SPF Management Tools for MSPs in 2026 A Buyer’s Guide
Best SPF Management Tools for MSPs in 2026 A Buyer’s Guide explains SPF record management, sender authentication, troubleshooting steps, and how AutoSPF.
Advanced 24 min
Best SPF Management Tools for SaaS in 2026 A Buyer’s Guide
SPF (Sender Policy Framework) record management is the ongoing process of maintaining the DNS TXT record that tells receiving mail servers which IP addresses.
Advanced 22 min
Google & Yahoo’s Bulk Sender Mandate: What Changed in Two Years
The Numbers, the Gaps, and What Senders Still Need to Fix - The mandate worked, at macro scale.
Advanced 24 min
Email Authentication in Government and Critical Infrastructure
A Global Compliance Report, What Works, What’s Broken, and What’s Next - Government mandates work, but only where they have teeth. The US reached 81.6% of .
Advanced 18 min
The Hidden Cost of Email Deliverability Failures for Enterprises
What CFOs and IT leaders need to know about the ROI of email authentication. US breach costs hit an all-time record, making SPF and DKIM essential.
Advanced 12 min
How can I run an SPF lookup for multiple domains at scale?
Use an asynchronous, rate-limited DNS worker pool that tracks SPF’s 10-lookup budget, parses mechanisms (include, redirect, a, mx, ptr.
Advanced 5 min
Automating SPF Record Management: A Smarter Approach For MSSPs
MSSPs often manage dozens or even hundreds of client domains, each with its own SPF configuration. Handling this manually can quickly become overwhelming.
Advanced 12 min
What limitations should I be aware of when relying on an SPF record tester?
SPF record testers are valuable diagnostics but they can mislead you because they may not fully enforce the 10-DNS-lookup limit (especially with nested.
Advanced 12 min
How can I interpret the results from an SPF record checker if I see multiple include mechanisms?
If an SPF checker shows multiple include mechanisms, interpret each as a delegated check of another domain’s SPF that is evaluated left-to-right for the same.
Advanced 12 min
What are the best practices illustrated by an SPF record example to avoid DNS lookup limits?
The best practices to avoid SPF DNS lookup limits are to use only necessary lookup‑triggering mechanisms, prefer ip4/ip6 literals and CIDR ranges.
Advanced 13 min
Advanced SPF Record Testing: Protect Your Domain from Permerror Issues
To protect your domain from SPF permerror issues, enforce strict syntax validation.
Advanced 13 min
Erweiterte SPF-Record-Tests: Schützen Sie Ihre Domain vor PermError-Problemen
Um Ihre Domain vor SPF-PermError-Problemen zu schützen, erzwingen Sie eine strikte Syntaxvalidierung.
Advanced 13 min
Pruebas avanzadas de registros SPF: proteja su dominio de los problemas de permerror
Para proteger su dominio de los problemas de permerror en SPF, aplique una validación estricta de la sintaxis.
Advanced 13 min
Test avancé des enregistrements SPF : protégez votre domaine des problèmes de permerror
Pour protéger votre domaine des problèmes de permerror SPF, imposez une validation syntaxique stricte.
Advanced 13 min
Test avanzato dei record SPF: protegga il suo dominio dai problemi di permerror
Per proteggere il suo dominio dai problemi di permerror SPF, imponga una convalida rigorosa della sintassi.
Advanced 13 min
高度なSPFレコードテスト: PermError問題からドメインを守る方法
SPFのpermerror問題からドメインを守るには、厳格な構文検証を徹底しましょう。
Advanced 13 min
Geavanceerde SPF-recordtesten: bescherm uw domein tegen PermError-problemen
Om uw domein te beschermen tegen SPF-permerrorproblemen, dwingt u strikte syntaxisvalidatie af.
Advanced 13 min
Zaawansowane testowanie rekordów SPF: ochrona domeny przed problemami z PermError
Aby chronić domenę przed problemami z SPF permerror, należy wymuszać rygorystyczną walidację składni.
Advanced 13 min
Teste Avançado de Registros SPF: Proteja Seu Domínio Contra Problemas de PermError
Para proteger seu domínio contra problemas de permerror do SPF, imponha uma validação rigorosa de sintaxe.
Advanced 12 min
What are the best practices an SPF record generator should enforce for reliability?
An SPF record generator should enforce RFC 7208-compliant syntax and semantics; cap and flatten DNS lookups to stay under the 10-lookup limit; manage record.
Advanced 11 min
What Are The Best Practices An SPF Checker Should Recommend For Maintaining SPF Records?
The best practices an SPF checker should recommend are to keep records within the 10-lookup and size limits.
Advanced 11 min
What Causes An Email To Be Rejected For Sender Policy Framework After A DNS Change?
Emails are typically rejected for SPF after a DNS change because receiving servers still reference cached/propagating DNS data.
Advanced 13 min
What Are The Most Common Issues Highlighted In An SPF Record Breakdown?
The most common issues highlighted in an SPF record breakdown are syntax and qualifier mistakes (missing v=spf1, multiple records, malformed mechanisms).
Advanced 12 min
How Do I Verify That Google Recognizes My Domain's SPF Record?
To verify that Google recognizes your domain’s SPF record, first query your SPF TXT record via public resolvers (for example, dig +short TXT yourdomain.com @8.
Advanced 7 min
Mastering Postmark SPF & DKIM Setup - An AutoSPF Guide to Bulletproof Email Authentication
When you send email from your systems - whether it’s transactional notifications, marketing campaigns, or account alerts.
Advanced 7 min
From Monitoring to Enforcement: Building a Scalable DMARC Strategy for Long-Term Email Protection
Protecting your entire email ecosystem and ensuring that an attacker cannot intercept or spoof your outgoing emails requires more than just cursory checks.
Advanced 6 min
SendGrid SPF & DKIM Setup: Authentication Guide
Set up SPF, DKIM, and DMARC for SendGrid correctly. A step-by-step guide to authenticating your domain and keeping SendGrid email out of spam.
Advanced 13 min
How Can I Identify SPF Include Loops Or Recursive Includes With A Validator?
Use a DNS-aware, graph-based SPF validator that expands every include/redirect into an explicit include graph and runs cycle detection (e.g.
Advanced 14 min
What Is Kitterman SPF And How Does It Help With Email Deliverability?
Kitterman SPF is a free, standards‑aligned online SPF generator and validator that parses your domain’s SPF record, simulates real‑world checks (mechanisms.
Advanced 8 min
AutoSPF’s In-Depth Guide to Setting Up DMARC, SPF & DKIM on HostGator
Email spoofing, phishing, and other unauthorized email-domain abuse are serious threats - for everyday websites, businesses, and brands of all sizes.
Advanced 14 min
What Does An SPF Record Example Look Like For A Single Mail Provider?
“A correct, minimal SPF record for a single mail provider uses v=spf1 include:_spf.google.com ~all. Learn how to build and validate your SPF record.”
Advanced 7 min
Professional Database: How to Reach Top Managers and Business Owners
Reaching decision-makers has never been harder. CEOs delete generic emails without reading. Business owners ignore LinkedIn messages from strangers.
Advanced 17 min
How Can I Check If My SPF Record Is Set Up Correctly Using An SPF Record Tester?
To check if your SPF record is set up correctly, run an SPF record tester (for example, AutoSPF’s free SPF Analyzer) by entering your domain.
Advanced 15 min
How Can I Use An SPF Checker To Troubleshoot Email Delivery Issues After Changing Mail Providers?
Use an SPF checker to fetch your current SPF record, validate syntax, confirm the new provider’s include and IPs, simulate sending IPs for pass/fail.
Advanced 4 min
Best Practices for Financial Institutions to Prevent Business Email Compromise
For quite a few years, malware like ransomware, phishing, Denial-of-Service (DoS/DDoS) attacks.
Advanced 7 min
Optimizing SPF for startups using multiple email service providers
The growing technical stack, which includes transactional emails, marketing automation, and sales outreach tools.
Advanced 5 min
AI Data Collection at Scale: Why Most Teams Choose Managed Proxy Services Over Servers
If you’re building AI systems that rely on large-scale data collection, chances are you’ve hit the proxy dilemma.
Advanced 4 min
How do cybercriminals use neglected domains to evade SPF and DMARC protections?
Cybersecurity experts are lately highlighting the degree to which threat actors have gone in abusing security protocols.
Advanced 14 min
SPF Compression: A Comprehensive Guide to Benefits and Techniques
SPF Compression and Its Role in Email SPF compression is more than just a technical buzzword; it’s an essential practice that enhances the functionality of.
Advanced 12 min
Multiple SPF Records: Essential Configuration for Email Authentication
Can You Have Multiple SPF Records? The crux of the matter is that you cannot have multiple SPF records for a single domain.
Advanced 7 min
Invisible SPF failures: How misconfigured DNS entries are costing enterprises millions!
There’s a common misconception among domain owners when it comes to email authentication protocols - we have configured SPF, DKIM, and DMARC.
Advanced 5 min
The healthcare industry is the most sought-after by cybercriminals
The healthcare industry depends a lot on technology - whether it’s online appointments, digital health records, or connected medical devices.
Advanced 5 min
SPF and multi-tenant email service providers: a collision course?
During the 2024 Black Friday to Cyber Monday (BFCM) period, Mailchimp customers sent billions of emails.
Advanced 6 min
Shadow admins: How do you uncover the mask of these stealthy accounts?
Most organizations have strict norms and regulations on what resources their employees can access - like which systems are open to all.
Advanced 16 min
Understanding the Trello Breach: Security Concerns and Expert Response
The Trello breach, which occurred in January 2024, resulted in approximately 15 million users having their email addresses, names, usernames.
Advanced 3 min
Gmail, Outlook, and Apple Mail warn users ahead of anticipated AI menaces in 2025
Gone are the days when incorrect grammar, poor graphics, an unprofessional tone, and other flaws were red flags of a phishing email.
Advanced 5 min
Cyber resilience 2025- a bigger picture of technical agility and adaption for businesses
In general, cyber resilience is a company’s ability to withstand, respond to, and recover from cyberattacks or IT failures while continuing to operate smoothly.
Advanced 4 min
The point where DORA and DMARC intersect
DORA (Digital Operational Resilience Act) is a Europe-based framework explicitly designed to establish regulatory compliance for the finance sector.
Advanced 4 min
How does Privileged Account and Session Management (PASM) help strengthen DMARC and email security?
The truth is that the most important people in your organization are also the most targeted individuals for cyber-attacks due to their access to the most.
Advanced 4 min
Overly permissive SPF configurations that make your email infrastructure vulnerable to phishing and spoofing
Overly permissive SPF configurations refer to settings that are set so loosely and broadly that anyone on the Internet can send emails from your domain.
Advanced 5 min
Everything you should know about typosquatting and how to stay protected
They say familiarity is deceptive, and we absolutely agree with it, especially in the context of cybersecurity.
Advanced 5 min
Everything you should know about typosquatting and how to stay protected
They say familiarity is deceptive, and we absolutely agree with it, especially in the context of cybersecurity.
Advanced 3 min
Resolving custom domain configuration issues for Azure Email Communication
It’s important to properly configure your domains so that email deliverability is not hampered.
Advanced 3 min
Impersonation is the leading phishing strategy of 2024
A famous software firm, Egress, published its Phishing Threat Trends Report in October 2024.
Advanced 6 min
8 cybersecurity trends that will redefine the digital landscape in 2024
The ever-evolving digital landscape is bringing both solace and trouble to people. Cyber advancement has made both our professional and personal lives easy.
Advanced 5 min
Automating SPF macro management with scripting and APIs: a step-by-step guide
They dynamically dilate to specific values based on the characteristics of the email being processed, letting SPF mechanisms be more flexible and adaptive.
Advanced 5 min
SPF for multi-domain environments: challenges and solutions
Most large-scale businesses own multiple domains and subdomains, which are heavily used for sending emails.
Advanced 5 min
What Is a Secure Email Gateway (SEG)?
A secure email gateway (SEG) filters inbound and outbound mail to block phishing, spam, and malware. See how SEGs work and what they protect against.
Advanced 3 min
Configuring SPF, DKIM, and DMARC for Brevo (formerly Sendinblue)
To authenticate email sent through Brevo (formerly Sendinblue), add include:spf.brevo.com to your SPF record, configure Brevo's DKIM CNAME records from the dashboard, and publish a DMARC record. All three are required for full authentication.
Advanced 8 min
Fix '554 5.7.5 Permanent Error Evaluating DMARC Policy'
The '554 5.7.5 permanent error evaluating DMARC policy' bounce means your DMARC record is missing or invalid. Here's what causes it and how to fix it.
Advanced 5 min
SPF Alignment Failed: What It Means & How to Fix It
'SPF alignment failed' means your envelope and header From domains don't match for DMARC. Learn what SPF alignment is and how to fix the error.
Advanced 6 min
How is Sender Policy Framework (SPF) Delegation Done?
SPF delegation is a one-time setup where a domain owner gives control of their SPF record to an external email server or a third-party service to send emails.
Advanced 8 min
New Update: DMARC to be Mandatory for PCI DSS Compliance by 2025
Here’s a harsh truth- your customers’ card transactions are not as secure as you might think.
Advanced 4 min
How Does DNS Packet Fragmentation Affect the Sender Policy Framework?
How Does DNS Packet Fragmentation Affect the Sender Policy Framework? explains SPF record management, sender authentication, troubleshooting steps, and.
Advanced 7 min
SPF Best Practices for Protection Against Email Spoofing and Phishing; A Guide for CISOs
Emails are important yet one of the most vulnerable strings of corporate communication.
Advanced 4 min
How do you set up SPF and DKIM for Shopify?
Shopify is an e-commerce platform based out of Canada, and if you have an online store listed on it, then adding SPF and DKIM records is important.
Advanced 4 min
Resolving “The DNS Record Type 99 (SPF) Has Been Deprecated” Error
As per RFC 7208 Section 3.1, the developers felt the necessity to assign a new DNS RR type.