Microsoft Office Tutorials and References
In Depth Information
Changing an MX record
Changing an MX record
At this point, you have the option to switch the MX record that is pointing to your
onpremises Exchange environment to Exchange Online. This introduces an alternative hybrid
scenario where email from the Internet will first go through FOPE, or EOP if you are on the
latest release of Office 365. FOPE or EOP will scan the email for spam, viruses, and other
threats before routing the mail to online and on-premises mailboxes. This is known as
changing your organization’s Internet mail ingress point.
The benefit of this scenario is the ability for you to take advantage of FOPE or EOP filtering
and protection. By doing so, you can decommission your on-premises email filtering and
protection solution.
To change your Internet mail ingress point from on-premises Exchange to Exchange Online,
you will need to change the MX record. Locate the MX record for your organization and
change it, using the example in Table 11-4 as a guide.
TABLE 11-4 DNS MX record
DNS record type
MX riority
Target
MX record
0
<Domain> .mail.eo.outlook.com
After you have made this change to your MX record, you can use the Exchange Remote
Connectivity Analyzer (ExRCA) to test mail low. ExRCA has an Internet email test that allows
you to test inbound and outbound Internet email. Use the inbound test to ensure
Internetoriginated email messages make it to your online and on-premises mailboxes through
FOPE or EOP.
Centralized mail transport
There are two configuration options available when routing emails through Office 365
Exchange Online:
Route mail for both on-premises and online recipients through Exchange Online with
centralized mail transport disabled (default setting).
Route mail for both on-premises and online recipients through Exchange Online with
centralized mail transport enabled.
Centralized mail transport disabled
Disabled centralized mail transport is the default setting. Disabling centralized mail
transport basically means that FOPE or EOP process all inbound messages and are responsible
for routing messages to on-premises mailboxes or online mailboxes.
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