Create DNS records for Office 365 when you manage your DNS records
For detailed instructions about how to create DNS records for Office 365 operated by 21Vianet, including the MX record required for mail routing, see Create DNS records at any DNS hosting provider for Office 365.
More options and some things to be aware of:
If you don't know the DNS hosting provider or domain registrar for your domain, see Find your domain registrar or DNS hosting provider. For descriptions of what the DNS records do, see DNS basics.
Some DNS hosting providers don't let you create all the required record types, which causes Service limitations when your hosting provider does not support SRV, CNAME, TXT, or redirection. If your provider doesn't support SRV, TXT, or CNAME records, we recommend that you transfer your domain to a provider that supports all required record types.
To see which DNS records are required and find the values to use for each record, including the MX record for email, see Gather the information you need to create Office 365 DNS records. For descriptions of what the DNS records do, see DNS basics.