DomainKeys Identified Mail (DKIM) provides an additional layer of email security by enabling domain owners to attach a digital signature to their outgoing emails. This signature is generated using a private key associated with the sender’s domain and is included in the email’s header. The recipient email server can then use the public key, which is published in the sender’s DNS records, to verify the signature and ensure that the email was not altered during transit. By confirming that the email’s content hasn’t been tampered with, DKIM ensures the integrity and authenticity of the message. If the DKIM signature doesn’t match, it suggests that the email may have been modified or is potentially fraudulent. DKIM also helps in establishing the legitimacy of the sender, adding trust to the communication.