How to Change DNS Settings at ONE.com: Set Up DMARC, SPF & DKIM

January 28, 2025 · DMARC Analyzer Pro

Complete guide to adding DMARC, SPF, and DKIM records at ONE.com, one of the most popular hosting platforms in Belgium. Secure your email in minutes.

Introduction

ONE.com is one of the most visited hosting platforms in Belgium and across Europe, known for its user-friendly interface and affordable hosting plans. If your domain is registered with ONE.com, setting up email authentication records is critical to protect your business email from spoofing and improve your email deliverability rates.

This guide walks you through adding DMARC, SPF, and DKIM TXT records using ONE.com's DNS management panel. The entire process takes about 10 minutes.

Why Email Authentication Matters for Belgian Businesses

Belgium's digital economy relies heavily on email communication. With increasing phishing attacks targeting .be domains, having proper email authentication is no longer optional. DMARC, SPF, and DKIM work together to verify that emails claiming to come from your domain are legitimate. Without these records, anyone can send emails pretending to be your business -- a risk that can lead to financial fraud, data breaches, and reputational damage.

Before you start, use the free DNS Checker at https://dmarcanalyzer.pro/tools/dns-checker to see what records your domain currently has. This gives you a baseline to work from.

Step 1: Log In to ONE.com Control Panel

Go to https://www.one.com/admin/ and log in with your ONE.com credentials. After logging in, you will be taken to the ONE.com control panel dashboard. If you manage multiple domains, select the domain you want to configure from the domain dropdown at the top of the page.

Step 2: Open DNS Settings

In the control panel, navigate to the "DNS" section. You can find this under "Advanced settings" in the left menu, then click "DNS". This opens the DNS settings page where you can view and manage all DNS records for your domain. ONE.com displays records in a clean table format showing the type, hostname, and value of each record.

Step 3: Add Your SPF Record

Click the "Create record" or "Add record" button (a green plus icon may appear). Select "TXT" as the record type. Leave the "Hostname" field empty or enter @ to target the root domain. In the "Value" field, enter your SPF record.

If you use ONE.com's email service, a suitable SPF record is: v=spf1 include:_spf-eu.one.com ~all. If you also use third-party email services, include them: v=spf1 include:_spf-eu.one.com include:_spf.google.com ~all. Click "Save" to create the record.

Important: Only one SPF record is allowed per domain. If an SPF record already exists, edit it to add the new include statement rather than creating a duplicate. Use the SPF Checker at https://dmarcanalyzer.pro/tools/spf-checker to make sure your record is valid.

Step 4: Add Your DKIM Record

DKIM records let receiving servers verify that your emails have not been altered during transmission. Your email service provider will give you the DKIM values. To add a DKIM record at ONE.com: Click "Create record" and select "TXT". In the "Hostname" field, enter your selector followed by ._domainkey (example: selector1._domainkey). In the "Value" field, paste the DKIM public key from your email provider, starting with v=DKIM1; k=rsa; p=... and click "Save".

ONE.com may have automatic DKIM signing for their hosted email. Check your existing DNS records -- if you see an entry with _domainkey in the hostname, DKIM may already be active.

Step 5: Add Your DMARC Record

Now tie everything together with a DMARC record. Click "Create record" and select "TXT". In the "Hostname" field, enter _dmarc. In the "Value" field, enter: v=DMARC1; p=none; rua=mailto:dmarc@yourdomain.be; adkim=r; aspf=r.

This starts DMARC in monitoring mode. You will receive aggregate reports showing who is sending email using your domain. Once you have analyzed these reports and confirmed all legitimate senders are authenticated, you can tighten the policy to p=quarantine or p=reject.

Generate the perfect DMARC record for your needs at https://dmarcanalyzer.pro/tools/dmarc-builder -- it takes 30 seconds and handles all the technical details for you.

Step 6: Verify Your DNS Records

ONE.com DNS changes usually propagate within 5 to 30 minutes. After a short wait, head to https://dmarcanalyzer.pro/tools/dns-checker and enter your domain. The tool checks for SPF, DKIM, and DMARC records and flags any misconfigurations instantly.

Start Monitoring with DMARC Analyzer Pro

Once your records are live, the real work begins: monitoring. DMARC Analyzer Pro at https://dmarcanalyzer.pro is built specifically for this purpose. It collects your DMARC aggregate and forensic reports, visualizes them in an intuitive dashboard, and gives you AI-powered recommendations to strengthen your email security.

Key features include automatic report parsing and visualization, identification of all email sources using your domain, progress tracking from p=none to p=reject, security alerts for new unauthorized senders, SPF flattening to stay under the 10-lookup limit, and a sender reputation monitor. Start your free trial at https://dmarcanalyzer.pro/register.

Troubleshooting Common ONE.com DNS Issues

Record not saving: ONE.com validates TXT records before saving. Make sure there are no extra spaces or line breaks in your record values. Copy the values exactly as provided.

SPF record conflict: If ONE.com has a default SPF record, you may need to edit it rather than create a new one. Look for an existing TXT record starting with v=spf1.

DNS propagation delay: If your records are not showing up after 30 minutes, try clearing your local DNS cache or testing from a different network. You can also use the DMARC Analyzer Pro DNS checker which tests from multiple global locations.

Conclusion

Setting up DMARC, SPF, and DKIM at ONE.com is a quick process thanks to their straightforward DNS management interface. These three records form the foundation of your email security strategy. Pair them with ongoing monitoring through DMARC Analyzer Pro (https://dmarcanalyzer.pro) to ensure your domain stays protected and your emails reach their destination.