Configure your MX record An MX record is an entry in a DNS database that defines the host willing to accept mail for a given machine. Your MX records must route email through Cloud Email Security to your mail server. The only thing you need to do for inbound mail is modify the Mail eXchange (MX) records in your organization's Domain Name System (DNS). Contact your DNS manager (usually your Internet service provider (ISP)) and ask them to replace your current MX records with the following DNS records: United States - smtp02-in.isheriff.com Canada - smtp01.ca.isheriff.com Germany - smtp01-in.isheriff.com South Africa - smtp01.za.isheriff.com This would route all your incoming mails through Cloud Email Security and then after scanning those mails will be delivered to your internal mail server. Note Email Security must be configured before you update your MX record.