Protecting Your Domain From Hijacking: What Email Senders Must Do

Protecting Your Domain From Hijacking: What Email Senders Must Do

Your domain is the foundation everything else sits on. Your email reputation, your website, your customer trust — all of it depends on your domain being under your control. Domain hijacking, where an attacker transfers or seizes control of your domain without authorization, can undo years of work in hours.

For email senders specifically, losing a domain is catastrophic. It means losing your sending history, your IP reputation, your authenticated email setup, and your ability to receive incoming mail. Recovery is possible but takes weeks and sometimes requires legal intervention.

How Domain Hijacking Happens

Most domain hijacking doesn't require sophisticated technical attacks. The most common methods are straightforward:

Account compromise at the registrar: Attackers gain access to your domain registrar account through phishing, credential stuffing using leaked username/password combinations, or by compromising the email address tied to your registrar account. Once in, they can initiate a transfer or change nameservers in minutes.

Social engineering the registrar: Some registrars have been vulnerable to social engineering attacks where attackers impersonate the domain owner and convince support staff to make unauthorized changes.

Expired domain squatting: If your domain registration lapses — even briefly — someone can register it immediately and gain control of all email to your domain.

Supply chain attacks: Compromising a third party with legitimate access to your registrar account — an employee, a web developer, an IT vendor.

Locking Down Your Registrar Account

The most impactful thing you can do is secure the registrar account itself:

• Enable multi-factor authentication. This is non-negotiable. Without MFA, any password breach at the registrar or at your email provider exposes your domain. Use an authenticator app rather than SMS where possible.
• Use a dedicated email address for your registrar account — one not publicly associated with your company. If attackers don't know which address is tied to your registrar, they can't target it specifically.
• Set up auto-renewal and keep payment current. Many hijackings happen after a domain lapses due to an expired credit card. This is entirely preventable.
• Audit registrar account access regularly. Remove former employees and contractors immediately when they leave.

Registrar Lock

Most registrars offer a feature called Registrar Lock, Transfer Lock, or similar. When enabled, it prevents your domain from being transferred to another registrar without you explicitly unlocking it first — adding a meaningful barrier against transfer-based attacks.

Enable this for every domain you use for email. For high-value domains, some registrars offer additional tiers such as Registry Lock, which requires out-of-band verification before any changes can be made at all.

DNSSEC: Protecting Your DNS Records

Domain Name System Security Extensions (DNSSEC) adds cryptographic signatures to your DNS records, making it much harder for attackers to redirect your DNS traffic through spoofed records. If your registrar and DNS provider both support DNSSEC, enabling it is worthwhile — especially for domains that handle transactional email.

DNSSEC is a complement to, not a replacement for, properly configured email authentication. Your DNS security setup should include both — DNSSEC protecting the integrity of your DNS zone and SPF, DKIM, and DMARC protecting the authenticity of your email.

Monitoring for Unauthorized Changes

You should know immediately if any of these change without your authorization:

• Your nameservers
• Your MX records
• Your SPF, DKIM, or DMARC records
• Your registrar account contact information

Set up DNS monitoring — many providers offer alerts when records change. For email senders, watching your MX records is especially critical: if an attacker changes your MX records, they intercept all incoming mail without you knowing until users start reporting missing messages.

What Happens If Your Domain Is Hijacked

Act immediately. Contact your registrar's abuse team and escalate to urgent status. Document everything — account access logs, timeline, all communications. If the domain has been transferred out, file a transfer dispute through ICANN's dispute resolution process.

Simultaneously: notify your users that your email may be compromised, because the attacker now controls what appears to come from your domain. Document your full authentication setup so you can rebuild it quickly once you recover the domain.

Recovery timelines vary, but attacks that work through registrar support can sometimes be reversed within days. Completed domain transfers that have already propagated take longer — sometimes weeks.

Prevention Is the Only Reliable Strategy

Unlike blocklist removals or deliverability dips that can be fixed over time, domain hijacking is one of the few email infrastructure problems where prevention matters far more than recovery. The steps above — MFA, registrar lock, DNS monitoring, access audits — take an afternoon to implement and eliminate the vast majority of attack vectors.

If you're setting up a new domain for email, review MailDog's DNS security tools and explore the MailDog SMTP infrastructure to understand how proper domain setup fits into a complete, secured email stack. The MailDog documentation covers authentication record setup that works in tandem with the domain security measures described here.