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.

I need remote access Start with Dynamic DNS if your public IP address changes.
Email is not working Start with SMTP port 25 blocks, SMTP relay, or Backup MX.
I need branded email Compare email forwarding with business email hosting.

DNS and uptime guides

How Dynamic DNS works

Keep a hostname pointed at the right device when your public IP changes.

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What managed DNS is

Understand records such as A, MX, CNAME, and TXT from one dashboard.

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How DNS failover works

See how monitoring and backup IPs help protect website uptime.

Read guide

Email guides

SMTP port 25 blocked

Separate sending problems from receiving problems and choose the right fix.

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What Backup MX is

Learn how secondary MX servers queue inbound mail during outages.

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What SMTP relay is

Understand how apps, servers, and devices send outbound mail reliably.

Read guide

What email forwarding is

Use custom-domain aliases while keeping the inbox you already use.

Read guide

What business email hosting is

Compare hosted mailboxes with forwarding for professional domain email.

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Popular next reads

Email forwarding vs business email hosting

Choose between simple aliases and full hosted mailboxes for your domain.

Read comparison

Dynamic DNS for home servers

See how DDNS supports NAS devices, VPNs, cameras, and remote access.

Read guide

SMTP relay for printers and devices

Use authenticated sending for scanners, printers, NAS devices, and alerts.

Read guide

More practical guides

What is mail redirection?

Keep self-hosted inbound email working when your ISP blocks SMTP port 25.

Read guide

Dynamic DNS vs static IP

Compare the two approaches before paying for a fixed public address.

Read comparison

Dynamic DNS for security cameras

Use hostnames for DVRs, NVRs, and remote camera viewing.

Read guide

SMTP relay for web applications

Send password resets, alerts, and transactional messages reliably.

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Decision guides

Dynamic DNS for VPN

Keep VPN remote access usable when the office or home IP changes.

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SMTP relay vs business email hosting

Decide whether you need sending infrastructure, mailboxes, or both.

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Backup MX vs mail redirection

Choose between outage protection and inbound port 25 workarounds.

Read comparison

Managed DNS vs registrar DNS

See when DNS hosting should become more than a registrar checkbox.

Read comparison

Automation and SSL guides

What is a DNS API?

Automate Dynamic DNS, record changes, and validation workflows.

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What is URL forwarding?

Redirect branded domains or subdomains to the right destination.

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What is wildcard SSL?

Cover many subdomains with one flexible certificate.

Read guide

How ACME DNS validation works

Use TXT records to prove control and automate certificate renewal.

Read guide

Ready to choose a service?

Browse the service overview if you already know the problem and want the shortest path to a solution.

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Keep moving with the guide that matches the problem.

Keep remote access working Start with Dynamic DNS when your public IP changes. Fix email delivery Separate outbound sending issues from inbound mail problems. Automate DNS and SSL Use API-driven DNS updates and validation workflows. Compare service options Choose the right email setup before you commit.
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