Iredmail dkim

iRedMail!

iRedMail is a popular open-source mail server solution that provides a simple and easy-to-use way to set up a mail server. One of the key features of iRedMail is its support for DomainKeys Identified Mail (DKIM) authentication.

DKIM is a digital signature mechanism that helps prevent email spoofing and spamming by verifying the authenticity of an email message. Here's a brief overview of how DKIM works:

  1. Key generation: You generate a public-private key pair using a tool like OpenSSL.
  2. Selector: You choose a selector (e.g., "default") to identify the public key.
  3. Public key publication: You publish the public key in the DNS records of your domain.
  4. Email signing: When sending an email, your mail server uses the private key to sign the email message.
  5. Verification: The recipient's mail server checks the DKIM signature by looking up the public key in the DNS records and verifying the signature.

To set up DKIM with iRedMail, you'll need to:

  1. Generate the key pair: Run the command openssl genrsa -out /path/to/private/key 1024 to generate a 1024-bit private key. Then, run openssl rsa -pubout -in /path/to/private/key -out /path/to/public/key to extract the public key.

  2. Configure iRedMail: Edit the main.cf file in your iRedMail configuration directory (e.g., /etc/iredmail/main.cf) and add the following lines:

    dkim_selector = default
dkim_private_key = /path/to/private/key
dkim_public_key = /path/to/public/key

  3. Publish the public key: Add the public key to your DNS records. The format is:

    default._domainkey.example.com. IN TXT "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC..."

    Replace example.com with your domain name and MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC... with the actual public key.

  4. Restart iRedMail: Restart the iRedMail service to apply the changes.

After setting up DKIM with iRedMail, you can verify the signature by checking the email headers. The DKIM-Signature header should contain the signature and the v=DKIM1 tag should indicate that the email is signed using DKIM.

That's it! With DKIM set up, you'll have an additional layer of security to prevent email spoofing and spamming.