How to increase mail size in exchange 2013

In Exchange 2013, the default maximum message size is 10 MB. However, you can increase this limit to accommodate larger messages. Here are the steps to increase the maximum message size in Exchange 2013:

Method 1: Using the Exchange Management Console

1. Open the Exchange Management Console.
2. Navigate to "Organization Configuration" > "Hub Transport" > "Global Settings".
3. Double-click on "Global Settings" to open the properties page.
4. Click on the "Message Size" tab.
5. In the "Maximum message size (KB)" field, enter the new maximum message size you want to set (e.g., 20 MB).
6. Click "Apply" and then "OK" to save the changes.

Method 2: Using the Exchange Management Shell

1. Open the Exchange Management Shell.
2. Run the following command to set the maximum message size:

   Set-TransportConfig -MaxMessageSize 20480KB

   Replace 20480KB with the new maximum message size you want to set (e.g., 20 MB).

Method 3: Using the Registry Editor

1. Open the Registry Editor (Regedit.exe).
2. Navigate to the following key:

   HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeTransport\Parameters

3. Create a new DWORD value named MaxMessageSize and set its value to the new maximum message size you want to set (e.g., 20 MB).
4. Close the Registry Editor.

Important Notes:

• Increasing the maximum message size can impact the performance of your Exchange server, especially if you have a large number of users sending large messages.
• You should also consider increasing the maximum attachment size and the maximum recipient list size to accommodate larger messages.
• If you have a mixed Exchange environment (e.g., Exchange 2010 and Exchange 2013), you may need to configure the maximum message size on each server individually.