Set Up Email Domain Authentication

DKIM

To help ensure your email reach your recipients' inboxes, you can set up custom DomainKeys Identified Mail (DKIM) authentication for your domain. Inbox Service Providers like Google, Yahoo, and Microsoft use DKIM as a way to scan incoming emails for spam or spoofed addresses. Emails that fail authentication are more likely to arrive in a spam or junk folder.

To use DKIM with being Bing you can either add CNAME records to your DNS or insert a public/private key into your DNS.

CNAME Method

To set up DKIM by adding CNAME records to your domain follow the below steps.

In your domain’s DNS records create 3 CNAME records as per our example below for example.com.au.

bingmail1._domainkey.example.com.au. 3600 IN CNAME dkim1.ci.com.au.
bingmail2._domainkey.example.com.au. 3600 IN CNAME dkim2.ci.com.au.
bingmail3._domainkey.example.com.au. 3600 IN CNAME dkim3.ci.com.au.

Once added notify Bing customer service.

See RFC standards for more information on DKIM.

Private/Public Key Method

To set up the private/public key method please contact Bing Customer Service.

SPF

Bing also recommends that you add the bingmail.com.au domain name to any existing or new Sender Policy Framework (SPF) TXT record. A typical SPF for a company (example.com.au) using O365 will look like this.

example.com.au. 3600 IN TXT "v=spf1 include:spf.protection.outlook.com -all"

Adding Bing's mail servers look like this.

example.com.au. 3600 IN TXT "v=spf1 include:spf.protection.outlook.com include:bingmail.com.au mx -all"

Full SPF configuration depends on your requirements but example shows how it could be configured.

See RFC standards for more information on setting up SPF.