Valla DNS Learning Ecosystem
Start with the most common hosting problems, then level up into email records, SSL, and advanced DNS security. This Learning Hub now includes 45 practical guides for anyone running a domain, each with plain-English troubleshooting steps and free tool links.
Latest article
A skewed clock breaks TLS, logins, and 2FA. Learn how to test an NTP server and read stratum, offset, and root dispersion without the jargon.
45 articles ready to learn
A skewed clock breaks TLS, logins, and 2FA. Learn how to test an NTP server and read stratum, offset, and root dispersion without the jargon.
Deliverability is a reputation puzzle. Learn to combine IP blacklists, domain URIBLs and raw headers into one clear picture of why mail gets filtered.
A missing or mismatched PTR record is a top reason mail gets rejected. Learn what reverse DNS is, what forward-confirmed means, and how to fix it.
A launch-day security checklist for a fresh domain, lock down email spoofing, sign your DNS, and get TLS right before anyone abuses the gaps.
Ping says timeout but the site loads for others? Learn why a TCP reachability check beats a classic ICMP ping and how to read the result.
A calm, layer-by-layer triage for a site that won't load, DNS, reachability, TLS and HTTP, so you find the real cause instead of rebooting at random.
HTTP response headers reveal your server, cache behavior, redirect chains, and security posture. Learn which headers matter and what good looks like.
A recursive trace shows how a lookup walks from the root to your domain's nameservers. Learn to read delegation, glue records, and lame delegation.
Mail suddenly bouncing or landing in spam? A calm, ordered playbook that walks the whole email path, MX, auth, reputation and headers, to the root cause.
Moving DNS providers without downtime is a process, not a prayer. A before/during/after checklist using lookup, nameserver trace and propagation.
Your IP is clean but mail still lands in spam? The domains in your links may be listed on a URIBL. Learn what URIBLs are and how to check yours.
Should you use IMAP or POP3 to connect your email? Compare setup, ports, sync behavior, and common error fixes so your mailbox works reliably across devices.
Learn why emails fail without DKIM, how DKIM signatures are validated, and the exact DNS and server checks to fix spam placement and authentication rejections fast.
Learn how to create a DMARC record with the right policy, alignment, and reporting tags so you can prevent spoofing, reduce phishing risk, and improve email deliverability.
Learn how SPF works, why misconfigurations cause bounce-backs and spam placement, and how to build a valid DNS SPF record that improves deliverability.
Practical 2026 guide to ipv6 (aaaa records) missing, why some users can’t reach you with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to spf record exceeds 10 lookup limit, fix it fast with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to dns cache vs browser cache, clear the right one with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to complete dns propagation troubleshooting checklist 2026 with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to use the hosts file to test dns changes locally with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to how to configure outlook and apple mail with custom domain with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to mx, spf, dkim, and dmarc setup for better inbox delivery with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to aname / alias records at root domain explained with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to why emails are delayed (greylisting, queues, and dns) with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to fix delayed email delivery after mx record update with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to why is my website not reachable after dns change? with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to ssl certificate shows not secure after dns move with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to local network or router dns issues, office fix guide with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to .com vs country tld dns differences, what changes in 2026 with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to full timeline for migrating dns to a new provider with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to website down after dns change, a record fix checklist with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to dns hosting vs registrar, where should your records live? with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to how to enable dnssec on any domain with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to dnssec and caa records explained without the jargon with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to my domain was hijacked, emergency recovery steps with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to dns propagation basics for small business sites with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to gmail and yahoo bulk sender rules 2026 (dmarc + one-click unsubscribe) with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to www vs non-www, set it up correctly once with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to whois and domain lookup checks before renewals and transfers with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to imap vs pop3 vs smtp, which one do you need? with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to domain not working, quick dns lookup steps anyone can follow with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to blockchain domains and web3 dns, what traditional hosts should know with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to common dns typos that break everything with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to ssl not secure warning after dns move, easy recovery plan with tailored validation steps, commands, and recovery actions.
Practical 2026 guide to read email headers to diagnose spf and dkim fails with tailored validation steps, commands, and recovery actions.
Use this quick reference while editing DNS records in Valla DNS.
| Record Type | Purpose | Example Value | Where to Use |
|---|---|---|---|
| A | Points to IPv4 address | 192.0.2.1 | Root domain, www |
| AAAA | Points to IPv6 address | 2001:db8::1 | Modern devices |
| CNAME | Alias to another name | www → example.com | Subdomains only |
| ANAME / ALIAS | Root alias (provider-specific) | @ → target.host | Root to CDN |
| MX | Mail server destination | 10 mail.example.com | Email routing |
| TXT | SPF, DKIM, DMARC text policies | v=spf1 mx ~all | Authentication |
| CAA | Allowed certificate authorities | 0 issue "letsencrypt.org" | SSL security |
One short email when we publish a new guide. No spam, unsubscribe any time.