For detailed instructions about how to create DNS records for Office 365 operated by 21Vianet, including the MX record required for mail routing, click the link for your DNS hosting provider.
More options and some things to be aware of:
Don’t worry if your DNS hosting provider isn’t listed — you can follow the general instructions for creating DNS records for Office 365.
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 Understand DNS record types.
Some DNS hosting providers don’t let you create all the required record types, which causes service limitations. 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 Understand DNS record types.