GUIDES

Email & DNS guides

Practical, no-fluff guides to the things that break email deliverability and domain security — with the tools to check each one as you go.

• How to Check and Improve Your Domain Reputation

  What domain reputation means, how mailbox providers score it, how to check yours, and the concrete steps that raise it.

  8 min read

• Why Your Emails Go to Spam (and How to Fix It)

  The real reasons legitimate email lands in the spam folder — authentication, reputation, content, and list quality — plus how to fix each.

  9 min read

• How to Set Up SPF, DKIM, and DMARC Correctly

  A step-by-step walkthrough of email authentication: what each record does, how to configure them, and how to avoid the mistakes that silently break them.

  11 min read

• What Is a Subdomain Scanner and How to Use One

  What subdomains are, why finding them matters for security, and how to scan a domain for its subdomains — plus what to do with what you find.

  7 min read

• CNAME Records Explained: How to Check and Use Them

  What a CNAME record is, how it differs from an A record, common use cases, and how to look up and verify a CNAME for any domain.

  7 min read