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A Microsoft 365 administrator is configuring email routing for a new custom domain, 'example.com', in their tenant. They have added the domain and verified ownership. What specific DNS record type must be configured in the public DNS records for 'example.com' to ensure that all incoming emails are correctly delivered to the Exchange Online mailboxes?
- ACNAME record
- BMX record
- CSRV record
- DTXT record
Show answer & explanationAnswer & explanation
Correct answer: B. MX record
The MX (Mail Exchanger) record is a type of DNS record that specifies the mail server responsible for accepting email messages on behalf of a domain name. It is crucial for directing incoming emails to Exchange Online.
Why the other options are wrong
- A. CNAME records create aliases for domain names, not for email routing.
- C. SRV records identify hostnames and port numbers for specific services, not direct email routing.
- D. TXT records are used for various purposes like SPF or domain verification, not primary email routing.
DNS MX Record
A Mail Exchanger (MX) record is a type of resource record in the Domain Name System (DNS) that specifies a mail server responsible for accepting email messages on behalf of a recipient's domain.
- Essential for email delivery.
- Points to the mail server (e.g., Exchange Online).
- Multiple MX records can be used for redundancy with priority settings.
Memory trick: MX marks the spot where mail goes, like a postal code for your domain's inbox.