DNSExit knowledge base
Practical guides for DNS, email delivery, and uptime.
Start with the problem you are trying to solve, then follow the guide that explains the moving parts in plain language.
DNS and uptime guides
How Dynamic DNS works
Keep a hostname pointed at the right device when your public IP changes.
Read guideEmail guides
SMTP port 25 blocked
Separate sending problems from receiving problems and choose the right fix.
Read guideWhat SMTP relay is
Understand how apps, servers, and devices send outbound mail reliably.
Read guideWhat email forwarding is
Use custom-domain aliases while keeping the inbox you already use.
Read guideWhat business email hosting is
Compare hosted mailboxes with forwarding for professional domain email.
Read guidePopular next reads
Email forwarding vs business email hosting
Choose between simple aliases and full hosted mailboxes for your domain.
Read comparisonDynamic DNS for home servers
See how DDNS supports NAS devices, VPNs, cameras, and remote access.
Read guideSMTP relay for printers and devices
Use authenticated sending for scanners, printers, NAS devices, and alerts.
Read guideMore practical guides
What is mail redirection?
Keep self-hosted inbound email working when your ISP blocks SMTP port 25.
Read guideDynamic DNS vs static IP
Compare the two approaches before paying for a fixed public address.
Read comparisonDynamic DNS for security cameras
Use hostnames for DVRs, NVRs, and remote camera viewing.
Read guideSMTP relay for web applications
Send password resets, alerts, and transactional messages reliably.
Read guideDecision guides
SMTP relay vs business email hosting
Decide whether you need sending infrastructure, mailboxes, or both.
Read comparisonBackup MX vs mail redirection
Choose between outage protection and inbound port 25 workarounds.
Read comparisonManaged DNS vs registrar DNS
See when DNS hosting should become more than a registrar checkbox.
Read comparisonAutomation and SSL guides
How ACME DNS validation works
Use TXT records to prove control and automate certificate renewal.
Read guideReady to choose a service?
Browse the service overview if you already know the problem and want the shortest path to a solution.