Authenticate domain for mailing

To authenticate a domain for mailing, you'll need to set up a few records with your domain registrar and DNS provider. This process is also known as "Domain Key" or "DKIM" (DomainKeys Identified Mail) authentication.

Here's a step-by-step guide to help you authenticate your domain for mailing:

Step 1: Generate a public/private key pair

You'll need to generate a public/private key pair using a tool like OpenSSL. You can use an online tool like OpenSSL Online or download the OpenSSL software to generate the keys.

Step 2: Create a TXT record

Create a TXT record with your domain registrar and DNS provider. The record should contain the public key you generated in Step 1. The format of the TXT record is:

_domainkey.yourdomain.com. IN TXT "k=rsa; p="

Replace <public_key> with the actual public key you generated.

Step 3: Create a DKIM record

Create a DKIM record with your domain registrar and DNS provider. The record should contain the selector and the public key you generated in Step 1. The format of the DKIM record is:

selector._domainkey.yourdomain.com. IN CNAME

Replace <selector> with a unique selector (e.g., "dkim") and <dns_name> with the DNS name of your mail server (e.g., "mail.yourdomain.com").

Step 4: Configure your mail server

Configure your mail server to use the private key you generated in Step 1. This will sign your outgoing emails with the private key, allowing the receiving mail server to verify the authenticity of the email using the public key in the TXT record.

Step 5: Verify the authentication

Once you've set up the records and configured your mail server, you can verify the authentication by sending an email from your domain and checking the headers. The email should contain a "DKIM-Signature" header with the public key and a "Authentication-Results" header indicating that the email was authenticated.

Here's an example of what the headers might look like:

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yourdomain.com; s=dkim; h=from:to:subject:date; bh=...; b=...

Authentication-Results: yourdomain.com; dkim=pass (rsa-sha256; c=relaxed/relaxed; s=dkim; d=yourdomain.com)

If you're using a mail client like Gmail or Outlook, you can also check the "Authentication" tab in the email headers to verify the authentication.

That's it! By following these steps, you should be able to authenticate your domain for mailing and ensure that your emails are delivered securely and reliably.