Glossary
Beginner
What Is a Domain Health Check
Understand what a domain health report checks across DNS, email, SSL, reputation and website status.
Resources & Guides
Guides
Step-by-step DNS, email, SSL, website health and hosting guides to help you understand issues, fix problems and keep your domains running correctly.
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Start with the essentials
New to domain health? These guides explain the most common DNS, email and SSL concepts first.
Glossary
Beginner
What Is DNS Propagation
Learn why DNS changes do not appear everywhere instantly and how TTL affects updates.
Glossary
Beginner
What Is SPF
Learn how SPF helps email providers verify which servers can send mail for your domain.
Glossary
Beginner
What Is SSL/TLS
Learn how HTTPS certificates protect website traffic and why certificate errors happen.
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Choose a topic below to find practical guides and troubleshooting help.
Recommended
DNS & Domain
Learn how DNS records, nameservers, WHOIS, domain expiry and routing settings affect websites, email, SSL and domain health.
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Email Authentication
Learn how SPF, DKIM, DMARC, MX records and reverse DNS affect email authentication, trust and deliverability.
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SSL & HTTPS
Learn how SSL certificates, HTTPS redirects, CAA records and certificate validation affect website trust and security.
Blacklist & Reputation
Learn how IP blacklists, domain reputation, reverse DNS and mail server signals affect email trust and deliverability.
Website Health
Learn how HTTP status, redirects, headers, response time and website availability affect technical health and user trust.
Hosting & VPS
Learn how hosting, VPS setup, DNS zones, reverse DNS, SSL and server configuration affect websites and email.
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Troubleshooting
Step-by-step fixes for common domain, email, SSL and hosting issues.
Glossary
Simple definitions for DNS, email, SSL, website health and hosting terms.
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New to DNS or email?
Start with our most popular guides to build a strong foundation.
Explore popular guides →What are you trying to fix?
Choose the issue closest to your situation and start with the right guides.
My emails go to spam
Fix authentication, reputation and content issues that send legitimate mail to spam folders.
Get Help →My DNS changes are not working
Troubleshoot propagation delays, TTL, nameservers and records changed at the wrong provider.
Get Help →My SSL certificate shows an error
Resolve trust warnings, expired certificates, chain issues and CAA blocks.
- Why Does My SSL Certificate Show as Not Trusted
- Fixing an Expired SSL Certificate
- What Is a CAA Record
My website is slow or unavailable
Diagnose response times, HTTP errors, downtime and hosting limits affecting performance.
- Diagnosing Slow Website Response Times
- HTTP Status Codes Explained: 200, 301, 404 and 500
- Dealing with Hosting Provider Limits and Throttling
I moved hosting and something broke
Fix redirects, DNS TTL planning and migration issues after changing hosts.
- Migrating a Website to a New Host Without Downtime
- Broken Redirects After Website Migration
- Adjusting DNS TTLs Before a Site Migration
I want to understand DNS basics
Start with core record types that connect domains to websites and email.
Learn DNS basics →Featured guides
Recommended resources for common domain, email and website health issues.
Hosting & VPS
WordPress Email and DNS: SPF, DKIM and Deliverability Basics
Practical guide to WordPress email delivery: SMTP, contact forms, SPF, DKIM, DMARC, MX records, WooCommerce emails and common spam-folder issues.
Troubleshooting
Fixing ERR_TOO_MANY_REDIRECTS and Redirect Loops
Fix ERR_TOO_MANY_REDIRECTS caused by HTTP/HTTPS conflicts, www redirects, WordPress URL issues, CDN SSL modes, .htaccess rules and reverse proxy settings.
Hosting & VPS
Migrating a Website to a New Host Without Downtime
Practical guide to moving a website to a new host safely: backups, DNS TTL, files, database, testing, SSL, email records, final switch and post-migration checks.
Hosting & VPS
Setting Up a Self-Hosted Mail Server on a VPS
Practical guide to self-hosting email on a VPS: DNS records, rDNS, SPF, DKIM, DMARC, TLS, spam protection, reputation and common risks.
Glossary
What Is a Domain Health Check
Learn what a domain health check covers, including DNS, email auth, SSL, MX, blacklist signals, and expiry checks.
Troubleshooting
Troubleshooting DNS Propagation Problems
Troubleshoot DNS propagation, TTL, resolver cache, authoritative nameservers, local cache and records changed at the wrong provider.
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Not sure where to start?
Run a full domain health check first. The report helps identify DNS, email, SSL, blacklist and website issues before choosing a guide.