Ways to increase email size limit in Exchange Server 2013?

Read time 5 minutes

Effective management of mail flow within Exchange Server is essential for maintaining an efficient database system. The accumulation of large attachments in emails can lead to unnecessary data storage consumption. Fortunately, there are solutions available to address this concern. By configuring email size limits through the Exchange Management Shell and Exchange Admin Center, administrators can efficiently control the volume of data. However, it’s imperative for users to meticulously plan and take into account various factors related to message size limits before implementing these changes.

Why Exchange has a size limitation for email messages?

Microsoft limits the size limit for emails in Exchange Server due to several security reasons. In the absence of limitation, the server will receive many large email files and create a bottleneck situation in processing.

When an incoming email message reaches the pre-determined size limits, then it can cause many problems in the account. Some of the error message are following-

• “552: Message size exceeds maximum permitted.”
• “System Undeliverable, message size exceeds outgoing message size limit.”
• “Attachment size exceeds the allowable limit.”
• “The size of the message you are trying to send exceeds the global size limit of the server. The message was not sent; reduce the message size and try again.”

• Maximum size limits on incoming and outgoing messages
• Mailbox storage quota and maximum message size limits
• Users who are allowed to use more than current specified message size limits for sending/receiving emails

Keeping these considerations in mind, let us understand how we can alter the default mail size limits in Exchange Server 2013.

First, open Exchange Management Shell on your Exchange Server. Check the current server limit on emails by running the following cmdlets.

To check the Transport service emails limits, run this command:

To check receive/send connector service email limits, run the following command:

NOTE: Use “send” in place of “receive” in cmdlet to check send connector service emails limit

Now to change the emails size received by the Transport service, execute the following cmdlet:

NOTE: You can either increase or decrease message size limit using the above cmdlet.

Also, you can set limits for the results of the get-transportconfig cmdlets as:

NOTE: The above cmdlets do not consider if the attachments are included or not. Large messages with no attachments might stop immediately.

To set a Transport rule to avoid receiving attachments above a certain size limit (here 10MB) and to display a message, run the following cmdlet:

Thus, you can make use of Exchange Management Shell to manage the email size limit of your Exchange Server. Let us have an easier way to set these limits, through the Exchange Admin Center.

You can set a new rule form EAC as:

1. To set a rule for large attachments, go to mail flow>rules and click create a new rule after expanding +.
   
2. In the rule page, enter the details like name, message, filter, and other options. After this, click Save.
   

Exchange Admin Center allows setting the email size limit flowing into the server. To do this, perform the steps one-by-one:

1. Navigate to Exchange Admin Center>mail flow>receive connectors>… (more) and click Organization transport settings.
   
2. In organization transport settings, edit the values of Maximum number of recipients, Maximum receive message size (MB), and Maximum send message size (MB). Finally, click Save.
   

With these methods, you can manage Exchange data growth up to some extent. However, if you face issues like Exchange database corruption, you should try some tools that can recover data from EDB files.

Kernel for Exchange Recovery, an automated tool for recovery and migration, works for recovering inaccessible EDB data to Outlook PST, Microsoft 365 and more destinations.

Summing Up

Exchange Server can encounter challenges when dealing with excessively large emails. One effective solution is to adjust the maximum email size limits at various points in the mail flow. However, if you’re grappling with problems arising from corrupted Exchange database files, a reliable course of action involves recovering data from these damaged EDB files. A trusted tool for this task, such as Kernel for Exchange Server, not only adeptly repairs the data but also facilitates precise migration to a variety of destinations.