DNSExit knowledge base
Practical guides for DNS, remote access, 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 guideHosting guides
Shared hosting vs VPS
Choose between an easier managed starting point and a server with more control.
Read comparisonRemote access guides
Remote access without port forwarding
Choose the right path when router changes or inbound access are unavailable.
Read guideHow to access a home server behind CGNAT
See why CGNAT blocks inbound access and which relay path restores reachability.
Read guideWhat is CGNAT?
Understand why a shared ISP address can block inbound home access before you choose a workaround.
Read guideDynamic DNS vs Public Tunnel
Compare hostname updates with outbound-only tunnels before choosing.
Read comparisonWhat is a reverse tunnel?
Learn how an outbound-first tunnel makes a private local service reachable.
Read guidePublic Tunnel vs VPN
Choose between exposing one service and opening broader private-network access.
Read comparisonPublic Tunnel vs port forwarding
Compare an outbound tunnel with direct router exposure before choosing the safer route.
Read comparisonPort forwarding not working?
Check CGNAT, double NAT, service listeners, and the cases where a tunnel is the better answer.
Read guideAccess a home server without port forwarding
Choose the right path when a home web app needs access but the router cannot be opened.
Read guideReceive webhooks on localhost
See why callback providers need a public URL and how to test against a local app.
Read guideShare a local web app online
Send a preview link for a demo, review build, or temporary test site before deployment.
Read guideDNSExit as an ngrok alternative
Compare developer tunnels with DNSExit Remote Access for webhooks, local apps, and home servers.
Read comparisonDNSExit as a Cloudflare Tunnel alternative
Compare tunnel access with a DNS-first workflow that keeps Dynamic DNS and email services nearby.
Read comparisonDNSExit as a No-IP alternative
See how Free Dynamic DNS connects with Public Tunnel and Static-IP Relay when port forwarding fails.
Read comparisonReady to choose a service?
Browse the service overview if you already know the problem and want the shortest path to a solution.