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DNS records required for Exchange Online  with example 

 

 

External DNS records required for Exchange Online

 

DNS record

Purpose

Value to use

CNAME

(Exchange Online)

Helps Outlook clients to easily connect to the Exchange Online service by using the Autodiscover service. Autodiscover automatically finds the correct Exchange Server host and configures Outlook for users.

Alias: Autodiscover

Target: autodiscover.outlook.com

MX

(Exchange Online)

Sends incoming mail for your domain to the Exchange Online service in Office 365. If you want mail delivery to go to your old mail system, you will want to leave the existing MX records with a higher preference/priority.

Domain: For example, hsa.com

Target email server: <MX token>.mail.protection.outlook.com

Preference/Priority: 0/low

To set up your MX record, you will need to get your specific “MX token” by looking at the list of DNS records for your domain. To find it, choose your domain on the domain manager page in Office 365 (Admin > Domains or Admin > Manage your organization > Manage your domains for website and email), and then choose Manage DNS > View DNS records.

What is MX priority?

SPF (TXT)

(Exchange Online)

Helps to prevent other people from using your domain to send spam or other malicious email. Sender policy framework (SPF) records work by identifying the servers that are authorized to send email from your domain.

NoteNote:
Ensure any existing SPF records for other email distribution software remain in place (such as records for marketing email).

TXT Name @

Values: v=spf1 include:spf.protection.outlook.com –all

NoteNote:
If the firewall or proxy server blocks TXT lookups on an external DNS, you should also add this record to the internal DNS record.

TXT

(Exchange federation)

Used for Exchange federation for hybrid deployment.

TXT record 1: For example, contoso.com and associated custom-generated, domain-proof hash text (for example, Y96nu89138789315669824)

TXT record 2: For example, exchangedelegation.contoso.com and associated custom-generated, domain-proof hash text (for example, Y3259071352452626169)

CNAME

(Exchange federation)

Helps Outlook clients to easily connect to the Exchange Online service by using the Autodiscover service when your company is using Exchange federation. Autodiscover automatically finds the correct Exchange Server host and configures Outlook for your users.

Alias: For example, Autodiscover.service.contoso.com

Target: autodiscover.outlook.com


Here is the example of our Office DNS records

 

  

 

 


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