Step 1: Log in to Microsoft Exchange Server and go to the admin centre page

Click on the grid on the top left corner and choose Admin.

Step 2: On the left menu, go to Azure Active Directory

On the left menu, click on Show all
Scroll down a bit and click on Azure Active Directory

You land on a new page, click on Azure Active Directory on the left menu
A new menu appears, scroll down and click on Properties
Step 3: Disable security defaults

On the bottom, click on Manage Security Defaults
Select No within the right-hand slider window

Step 4: Go to the email settings of the email account you want to connect

On the left menu, click on Users > Active Users. Choose the account you want to connect by clicking on it, you should see a flyout coming from the right, click on Mail > Manage Email Apps

Step 5: Make sure IMAP is activated

On the new flyout on the right, make sure IMAP is checked like on the screenshot below. Then click on Save Changes. You should see a confirmation message highlighted in green telling you the information has been updated.

Step 6: Provide the details to MassMailer

Provide the following details to MassMailer in order to set up the MassMailer Inboxing Service.

First Name, Last Name, Email Address, Email Password, IMAP Server Host, IMAP Server Port