DomainKeys Identified Mail (DKIM)

To protect customers from unsolicited email, many ISPs check the domain key used in an email message to determine whether it is spam or not. DomainKeys Identified Mail (DKIM) is a method of digitally “signing” your email to allow its authentication.
When sending email from NetSuite, using your own domain key increases campaign delivery rates and help enhance your reputation as a legitimate marketer. Without DKIM, you cannot send more than 10,000 messages in a single email campaign.
It is recommended that the following steps are performed by someone with DNS experience. When set up, your domain keys will be used to authenticate all email sent from NetSuite.
In your NetSuite account:

1. Go to Setup > Company > Email > Email Preferences.
   
2. Click the Domain Keys subtab.
   
3. In the Domain Selector field, enter the first domain selector. You can name the selector anything you want, but it is recommended that you incorporate the current date in the selector name so that you know the age of each key.
   
4. In the Domain Name field, enter the domain name you are using.
   
5. Enter the Private and Public domain keys used for signing in one of the following ways:
   If you have used the same domain with another application, enter the domain keys manually. If you have not generated a domain key for this domain previously, click the Generate Key
   Pairs link to have NetSuite generate them for you.
   You need the public domain key to set up your domain with a domain hosting service.
   
6. After entering the domain keys, click DNS Entry. Your complete, properly formatted DNS entry is shown in a popup window. Copy this DNS entry. Do not close the browser window.
   

In your domain provider:

1. Open another browser window, and log in to your domain provider.
   
2. Add a text record with a name in the format selector1._domainkey.
   Use the selector name you entered in to NetSuite and make sure you append it with ._domainkey.
   
3. Paste or enter the value you copied after clicking the DNS Entry link in your NetSuite account.
   
4. Save the text record.
   

In your NetSuite account:

1. Back in your NetSuite account on the Email Preferences page, check the Active box for each key you have set up.
   
2. Click Save. All outgoing email messages sent from NetSuite using the selected keys will have a DKIM header.
   This code header contains the domain key information but does not add any text to your messages.
   

After setting up your domain with your provider, you can test your DKIM setup. For more information, see
DKIM Setup Verification.
For more information on DKIM, please visit:
DKIM.org
RFC 4871 DKIM Base Specification