How to set dkim mail value

DKIM (DomainKeys Identified Mail) is a method of verifying the authenticity of emails by adding a digital signature to the message headers. To set the DKIM mail value, you'll need to follow these steps:

Step 1: Generate a private key

You'll need to generate a private key using a tool like OpenSSL. You can use the following command:

openssl genrsa 2048 > private_key.pem

This will generate a 2048-bit RSA private key in a file named private_key.pem.

Step 2: Generate a public key

Use the private key to generate a public key:

openssl rsa -pubout -in private_key.pem > public_key.pem

This will generate a public key in a file named public_key.pem.

Step 3: Create a DKIM record

Create a TXT record in your DNS settings with the following format:

_kexample._domainkey IN TXT "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC4..."

Replace _kexample with a subdomain of your choice (e.g., _dkim or _mail). The p value should be the public key generated in Step 2, encoded in Base64.

Step 4: Set the DKIM mail value

In your email server configuration, set the DKIM mail value to the following format:

dkim=rsa; k=rsa; p=<base64-encoded-private-key>

Replace <base64-encoded-private-key> with the Base64-encoded private key generated in Step 1.

Here's an example of how to set the DKIM mail value in popular email server configurations:

• Postfix: Add the following line to your main.cf file: dkim = rsa; k = rsa; p = <base64-encoded-private-key>
• Exim: Add the following line to your exim.conf file: dkim_selector = rsa; dkim_key = <base64-encoded-private-key>
• Sendmail: Add the following line to your sendmail.cf file: Dkim = rsa; K = rsa; P = <base64-encoded-private-key>
• Amazon SES: In the AWS Management Console, go to the SES dashboard, click on "Email sending" and then "DKIM settings". Enter the public key and private key values.

Step 5: Verify your DKIM setup

After setting up your DKIM record and mail value, you can verify your setup using online tools like DKIM Analyzer or Mail Tester. These tools will help you identify any issues with your DKIM configuration.

Remember to update your DNS settings and email server configuration accordingly. It may take some time for the changes to propagate globally.