Message size limits allow you to specify the size of messages a user is allowed to send and receive. When a mailbox is created, there is no default size limit for sending and receiving messages.

In this best practice tip, we show you how to configure size limits in Microsoft Exchange and in the EWS interface.

Exchange

Set the message size limits using the Exchange Management Console.

Information: When configuring message size limits in Microsoft Exchange, refer to this Microsoft documentation:

In the following example, the maximum size of sent messages for Debra Garcia's mailbox is set to 25 MB, and to 35 MB for received messages. Enter the cmdlet in the Exchange Management Console PowerShell.

Set-Mailbox -Identity "Debra Garcia" -MaxSendSize 25mb -MaxReceiveSize 35mb

To verify that the settings were successfully applied, run the following command in the Exchange Management Console PowerShell:

Get-Mailbox -Identity <Identity> | Format-List MaxSendSize,MaxReceiveSize

EWS

To configure the message size in Exchange Web Services (EWS), run the Microsoft IIS web server.

You need to set the maxAllowedContentLength parameter in various IIS web server "web.config" files.

Information: You will find detailed information in the Microsoft documentation