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DomainKeys Identified Mail (DKIM) Settings for Sending Emails Using 8x8 Contact Center Internal SMTP Server

Updated: 08/29/2025

Objective

Enable DomainKeys Identified Mail (DKIM) to improve email authentication and deliverability using 8x8-managed DKIM keys.

Applies To

  • 8x8 Contact Centre
  • Outbound Emails sent via the 8x8 Contact Center Internal SMTP Server, with the from address on your domain.

Procedure

Decide if you will use 8x8-Managed DKIM Keys (recommended) or Use Your Own DKIM Keys. Then follow the steps in the relevant section for all of the domains that are used for sending emails from your 8x8 Contact Centre.
After setup, we recommend testing your email deliverability to ensure that DKIM signing is functioning correctly and your emails are being properly authenticated.

8x8-Managed DKIM Keys

  1. Add CNAME Records to Your DNS. These records allow 8x8 to authenticate your emails by using our managed DKIM keys.
  • CNAME Record 1
    • Host/Name: vcc_s1._domainkey.<yourdomain.com>
    • Type: CNAME
    • Value/Target: vcc_s1._domainkey.vcc.8x8.com.
  • CNAME Record 2
    • Host/Name: vcc_s2._domainkey.<yourdomain.com>
    • Type: CNAME
    • Value/Target: vcc_s2._domainkey.vcc.8x8.com.
  • Note: Many DNS providers automatically append your domain name to the host. In these cases, you should only enter vcc_s1._domainkey or vcc_s2._domainkey as the Host/Name field. The provider will resolve it to the full vcc_s1._domainkey.<yourdomain.com>.​​​​​​​
  1. After adding the records, verify they are published correctly and have propagated using a DNS lookup tool

Use Your Own DKIM Keys

This option allows organisations to manage their own DKIM setup for greater control over their email authentication process. By generating their own DKIM keys, organisations can implement a customised email signing approach. Here's how it works:
  1. Generate both public and private DKIM keys to handle email signing and verification.
  2. The public key must be added to the DNS as a TXT record. This involves creating a record with a specific format:
    • Record Name: <selector>._domainkey.<yourdomain.com>
    • Record Content: v=DKIM1; k=rsa; p=<your-public-key>
  3. Provide the private keys and selectors to 8x8, along with a list of domains this has been set up and request that these are added to the 8x8 Contact Centre email relays  

Additional Information 

Implementing DKIM (DomainKeys Identified Mail) is essential for optimising email deliverability by ensuring that your emails are authenticated and trusted by recipient servers. With DKIM, you reduce the risk of your messages being filtered into spam folders, as many email providers utilise these signatures to verify authenticity. This is important for reliable delivery to your recipients' inboxes.
Please also see Sender Policy Framework (SPF) Settings for Sending Emails Using 8x8 Contact Center Internal SMTP Server