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How to point MX records to 3rd party hosts from MS 365, for directing emails only.
Website to remain with MS 365
First, either clear out any existing MX records, or give them a priority number higher than 0.
Next, create an MX record for your domain:
Host Name: @
Points to Address: yourdomain-com.mail.eo.outlook.com
TTL: 1 hour
Also create an SPF (TXT) record:
TXT Name: @
TXT Value: v=spf1 include:outlook.com ~all
Finally an autodiscover record (CNAME):
Host name: autodiscover
Points to Address: autodiscover.outlook.com
TTL: 1 Hour