How to prevent email spoofing on your domain

Email spoofing allows attackers to send emails that look like they come from your domain. This can damage your reputation and trick users into trusting malicious messages. The solution is simple! Configure the right DNS records.

1. SPF (Sender Policy Framework)

SPF defines which servers are allowed to send emails for your domain.

v=spf1 include:_spf.google.com -all

If an email is sent from an unauthorized server, it will fail verification.

2. DKIM (DomainKeys Identified Mail)

DKIM adds a digital signature to your emails.

Your server signs emails with a private key
A public key is stored in your DNS
Receiving servers verify the signature

This ensures the email hasn’t been altered and is truly from your domain.

3. DMARC (Protection Layer)

DMARC tells servers what to do if SPF or DKIM fails.

v=DMARC1; p=reject;

Policies:

none → monitor only
quarantine → send to spam
reject → block spoofed emails

Conclusion

By combining SPF, DKIM, and DMARC, you can effectively prevent email spoofing on your domain.