What is MX record: A deep-dive session on Mail Exchange (MX) record. Learn how MX record work. Learn how to add MX record for custom domains in Office 365. Learn how to point MX record on 3rd part filtering services. Subscribe to our Newsletter: Website: LinkedIn: Facebook: Twitter: Instagram: mx record mx records setup mx record video mx records are not set up mx record change mx record mail server dns mx priority dns mx settings dns mx ttl dns mx records for office 365 dns mx txt dns mx record for subdomain