Intermediate 5 min
NCSC is retiring Web Check and Mail Check: Here’s what it means for security teams
Back in 2017, when the web wasn’t as structured as it is today from a security standpoint.
Knowledge Base
Blog
Expert guides on SPF, DKIM, DMARC, and email security.
Intermediate 12 min
How can I interpret the results of an SPF lookup to find configuration errors?
You can interpret SPF lookup results to find configuration errors by parsing the record’s mechanisms and qualifiers in order.
Intermediate 6 min
How To Set Up SPF For Avanan: Here’s What You Should Know
It’s 2026, and companies no longer use traditional on-premise email servers; they have now moved to cloud platforms like Microsoft 365 and Google Workspace.
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.
Foundational 12 min
SPF Lookup in 2026: Best Practices for Secure Email Authentication
In 2026, the best practices for secure SPF lookups are to keep SPF within the 10-DNS-lookup limit by optimizing and (selectively) flattening includes.
Intermediate 9 min
Why Email Delivery Fails - and How to Fix It (2026)
From hard bounces to silent drops, email delivery fails for many reasons. Learn the most common causes and how to fix email deliverability in 2026.
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.
Intermediate 6 min
550 From address violates UsernameCaseMapped Policy: Why does this happen, and how to fix it?
For an email to reach the recipient, it must meet the specific requirements set by the receiving server, which govern address syntax, authentication.
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.
Intermediate 12 min
SPF Checker Online: Ensure Compliance With Email Authentication Standards
Google’s SPF checker most often reports “no SPF record” when the domain publishes only the deprecated SPF resource record (not a TXT).
Intermediate 13 min
How does an incorrect SPF record affect my protection in Mimecast against spoofing?
An incorrect SPF record reduces Mimecast’s spoofing protection by causing SPF evaluation errors (fail, softfail, neutral, temperror, permerror).
Intermediate 13 min
What causes DKIM or SPF failures and how can I recognize them?
DKIM and SPF typically fail due to DNS record mistakes, signature-breaking message modifications, identity alignment mismatches, SPF’s 10-lookup limit.
Foundational 7 min
How to avoid spam and phishing emails in your inbox
Spam and phishing emails are no longer just a minor inconvenience sitting quietly in your junk folder.
Intermediate 12 min
How can I troubleshoot DKIM and SPF failures reported by mailbox providers?
To troubleshoot DKIM and SPF failures reported by mailbox providers, parse bounce and Authentication-Results data to separate SPF from DKIM issues.
Intermediate 12 min
What is the correct DNS record format to replace multiple SPF TXT records with a single valid one?
Publish a single DNS TXT record at the domain that begins with v=spf1 and combines all mechanisms (for example: “v=spf1 ip4:203.0.113.
Foundational 7 min
General email authentication and sender requirements for WooCommerce
WooCommerce stores rely heavily on email for everyday operations, from order confirmations and shipping updates to password resets and marketing campaigns.
Foundational 12 min
What are the common causes shown in an SPF record breakdown that lead to SPF failures?
The most common causes shown in an SPF record breakdown that lead to SPF failures are syntax/format errors (missing v=spf1, malformed mechanisms.
Foundational 11 min
What Happens To My Email Deliverability If My SendGrid SPF Record Is Missing Or Misconfigured?
If your SendGrid SPF record is missing or misconfigured, recipient servers will treat your messages as unauthenticated.
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.
Intermediate 12 min
How Can I Determine Whether I Need An SMTP Relay Service Provider For My Business Emails?
You need an SMTP relay provider if your sending volume, deliverability risk, compliance burden.
Intermediate 5 min
Common SPF and DKIM Misconfigurations That Hurt Deliverability
With cyberattacks becoming so severe and sophisticated, your organization cannot afford to leave its email ecosystem inadequately protected.
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).
Intermediate 11 min
What Are The Best Practices For Creating An SPF Record For Domains Managed Through GoDaddy?
The best practices for creating an SPF record for domains managed through GoDaddy are to publish a single TXT “v=spf1” record at the exact sending domain that.
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.
Intermediate 6 min
Rackspace SPF & DKIM Configuration: A Professional Guide By AutoSPF
Email authentication is a cornerstone of modern email security and deliverability.
Intermediate 6 min
How to Check Email Sender Reputation and Improve It
"Email deliverability starts with authentication," says Brad Slavin, General Manager of DuoCircle.
Intermediate 12 min
Can I Use Google Domains To Automatically Configure SPF Records For My Email Provider?
Yes - but with limits: Google Domains can automatically add an SPF record when you use its guided setup for Google Workspace.
Intermediate 6 min
The Ultimate AutoSPF Guide To Zendesk SPF & DKIM Configuration
In today’s email‑centric world, ensuring that your support and outbound emails are trusted by inbox providers like Gmail, Outlook, Yahoo.
Foundational 13 min
How can I use an SPF record tester to check if my domain's SPF is configured correctly?
Enter your domain or paste its v=spf1 TXT into an SPF record tester, run a full syntax + DNS-expansion check against a chosen sending IP and identities.
Intermediate 8 min
What is ARP spoofing, and how to detect and prevent it
ARP spoofing, also known as ARP poisoning, is a type of network attack that targets how devices communicate inside a local network.
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