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• Generate Dkim Key For Domain Registration
• Dkim Record Example
• Generate Dkim Key For Domain Name

Nov 01, 2019  To create the DKIM signature, you will have to specify only two tags of all the above: an authorized domain (d=) and a selector (s=). DKIM record generator is an online tool to create DKIM DNS record to protect your domain from email scam and phishing. Use this tool to generate your DKIM. The selector is used to identify the public DKIM Key details of the Domain. It is an attribute for the DKIM Signature and is included in the DKIM header of the email. You can use multiple selectors for a single domain in cases where you need to provide Special Signatory Controls for different sets of users. DKIM Core Tools Generate a DKIM Core Key. Domain name: Enter the domain you'd like to generate keys for, for example dkimcore.org and hit the button. If you're thinking of using these keys in production, you should check the security notes first. Check a published DKIM Core Key.

• Mar 28, 2019 Clear 3-step instructions for implementing DKIM. We explain how to create the public / private key pair, configure the DNS record, generate and save the DKIM signature. Get the details here (including instructions for 15 DNS providers).
• DKIM Wizard This wizard will allow you to easily create a public and private key pair to be used for DomainKeys and DKIM signing within PowerMTA™. The key pair will be used for both DomainKeys and DKIM signing.Policy records are no longer included as they are part of the deprecated DomainKeys, and not DKIM.
• A selector is arbitrary string appended to the domain name, to help identify the DKIM public key. It is part of the DKIM signature, and is inserted into the DKIM-Signature header field. During the validation process, the selector adds an additional name component, allowing for differential DNS query names.

Introduction

This document describes how to configure DKIM signing on an ESA.

Requirements

Generate Dkim Key For Domain Registration

1. Access to the Email Security Appliance (ESA).
2. Access to DNS to add/remove TXT records.

Ensure that DKIM signing is off

Before we make any changes, we want to ensure that DKIM signing is off in all mail flow policies. This will allow us to configure DKIM signing without any impact to mail flow:

1. Go to Mail Policies > Mail Flow Policies.
2. Go to each mail flow policy and ensure that 'Domain Key/DKIM Signing' is set to 'Off.'

Create a DKIM signing key

You will first need to create a new DKIM signing key on the ESA:

1. Go to Mail Policies > Signing Keys and select 'Add Key..'
2. Name the DKIM key and either generate a new private key or paste in an existing one.

   Note: In most cases, it's recommended that you choose a 2048 bits private key size.

3. Commit the changes.

Generate a new DKIM signing profile and publish the DNS record to DNS

Next, you will need to create a new DKIM signing profile, generate a DKIM DNS record from that DKIM signing profile and publish that record to DNS:

1. Go to Mail Policies > Signing Profiles and click 'Add Profile..'
   1. Give the profile a descriptive name in the field 'Profile Name.'
   2. Enter your domain in the field 'Domain Name.'
   3. Enter a new selector string into the field 'Selector.'
      

      Note: The selector is an arbitrary string that is used to allow multiple DKIM DNS records for a given domain.
      

   4. Select the DKIM signing key created in the previous section in the field 'Signing Key.'
   5. Click Submit.
2. From here, click 'Generate' in the column 'DNS Text Record' for the signing profile you just created and copy the DNS record that is generated. It should look similar to the following:
   
3. Commit the changes.
4. Submit the DKIM DNS TXT record in step 2 to DNS.
5. Wait until the DKIM DNS TXT record has been fully propagated.
6. Go to Mail Policies > Signing Profiles.
7. Under the column 'Test Profile', click 'Test' for the new DKIM signing profile. If the test is successful, continue with this guide. If not, confirm that the DKIM DNS TXT record has been fully propagated.

Turn DKIM signing on

Dkim Record Example

Now that the ESA is configured to DKIM sign messages, we can turn DKIM signing on:

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1. Go to Mail Policies > Mail Flow Policies.
2. Go to each mail flow policy that has the 'Connection Behavior' of 'Relay' and turn 'Domain Key/DKIM Signing' to 'On.'
   

   Note: By default, the only mail flow policy with a 'Connection Behavior' of 'Relay' is the mail flow policy called 'Relayed.' The important thing to remember here is that we only want to DKIM sign messages that are outgoing.
   

3. Commit the changes.

Test mail flow to confirm DKIM passes

At this point, you are done with configuring DKIM any further. However, you should test DKIM signing to ensure that it's signing your outbound messages as expected and passing DKIM verification:

Generate Dkim Key For Domain Name

1. Send a message through the ESA ensuring that it gets DKIM signed by the ESA and DKIM verified by another host.
2. Once the message is received on the other end, check the headers of the message for the header 'Authentication-Results.' Look for the DKIM section of the header to confirm if it passed DKIM verification or not. The header should look similar to the following:
3. Look for the header 'DKIM-Signature' and confirm that the correct selector and domain are being used: