DKIM
DKIM is a technical method that helps ensure emails are not tampered with when they travel from the sender to your inbox.
DKIM stands for DomainKeys Identified Mail. It is a way to verify that an email was sent by the domain it claims to be from and that it hasn't been changed along the way. When an email is sent, the sender's email server adds a digital signature to the message. This signature is based on a private key that only the sender's server has. When the email arrives at your inbox, the receiving server checks the signature using a public key associated with the sender's domain.
What it means
DKIM uses public-key cryptography to sign emails. The sender's domain has a public key that is published in its DNS records. When an email is received, the recipient's server uses this public key to verify the digital signature. If the signature matches, the email is considered authentic and has not been altered.
Why it matters
DKIM helps prevent email spoofing and phishing attacks. By verifying the authenticity of the email, it makes it harder for scammers to send fake messages that appear to come from a trusted source.
What to do
If you run an email server, enable DKIM to add an extra layer of security. Most email platforms and email service providers offer DKIM setup as part of their security features. You can also use free tools to check if DKIM is properly configured.