What is DKIM?

What is DKIM?

DKIM stands for «DomainKeys Identified Mail» and is an email authentication method. It ensures that an email was actually sent from the specified domain and was not altered in transit.

How does DKIM work?

When sending an email, a digital signature is inserted into the email header. This signature is generated using a private key known only to the mail server. The receiving mail server can verify the signature using the public key stored as a DNS record (TXT record) at selector._domainkey.yourdomain.ch.

If the signature is valid, the recipient knows:

• The email genuinely originates from this domain
• The content was not manipulated in transit
• The sender is authorized to send on behalf of this domain

DKIM at FireStorm

At FireStorm, DKIM is automatically activated for all domains. You don’t need to configure anything — the DKIM record is set automatically when your domain is registered.

DKIM works together with SPF and DMARC to provide comprehensive email protection. These three technologies together form the foundation for secure email communication.

Check DKIM

You can verify if DKIM is correctly set up for your domain using our DANE Checker.

Check DKIM now