In Easy365Manager, you can enter a number in “Maximum size for received messages (KB)” to manage the maximum size of incoming emails for a specific mailbox.
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You can quickly locate the setting by opening up properties for a user, selecting the Mailbox tab, and clicking on Delivery Restrictions.
This opens up the following form, where “Maximum size for received messages (KB)” is found:

In Easy365Manager, the “Maximum size for received messages (KB)” setting corresponds to the ‘MaxReceiveSize’ parameter of the Set-Mailbox PowerShell command.
The value entered with the PowerShell command “Set-Mailbox -MaxReceiveSize” limits the size of messages that a mailbox can receive:
Set-Mailbox -Identity lene.hau -MaxReceiveSize 36864KB
Using this command provides several benefits. It helps in managing the Exchange Server’s resources effectively by preventing large emails from consuming excessive storage space and network bandwidth while also ensuring that the mailbox remains within acceptable size limits, preventing potential performance issues. Furthermore, controlling the maximum receive size can be useful for enforcing email policy compliance and maintaining efficient email traffic.
Administrators can tailor these size limits to align with their organization’s needs, optimizing the balance between efficient resource usage and user communication requirements.