The new Office 365 Hybrid Configuration Wizard
Change MX records
For this step, we have to use whatever interface we normally use to manage our DNS records. In my case, this would be No-IP which I will use as an example.
Note: I have edited the images (screenshots) below to conceal certain details.
So I log in and go to the "Manage Domains" section...
I select the domain associated with the MX records that I want to change:
In the following screen, we have to scroll to the very bottom where we see the section for MX records. This is what was configured before the modification:
The MX record (which is not displayed as in other interfaces - it seems that we do not see the record itself) points to the A record for "mail.mitserv.net" which in turn points to the external IP address of my test network (where 1 to 1 NAT forwards incoming messages to my Citrix NetScaler VPX).
Regardless, I change the MX record so it points to the following A record:
But wait! Where did I find that record?
We have to access our Office 365 account and in the Admin center, we click on "Domains":
I select my domain:
Here is the MX record that should be entered:
Run the Office 365 Hybrid Configuration Wizard (again)
Please consult the blog post referenced in the hyperlink above.
We repeat exactly the same steps with one exception:
We do not check the "Enable centralized mail transport" option.
And that's all.