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What size limits should I impose on all outgoing messages? What size limits should I impose on all incoming messages?

If you want to know more about how to control how many messages are sent over time, how many connections are allowed over time, and how long Exchange will wait before closing a connection, see Message rate limits and throttling.Īs you plan the message size limits for your Exchange organization, consider the following questions: This topic only talks about message and recipient size limits. You can apply these limits to your entire Exchange organization, to specific mail transport connectors, specific servers, and to individual mailboxes. For example, you could restrict the maximum size of the message header or attachments, or set a maximum number of recipients that can be added to the message. You can set the maximum size of an entire message as a whole, or the size of individual parts of a message, or both. These users will be able to exchange large messages withĮach other, but not with Internet senders and recipients (unauthenticated senders and recipients).You can apply limits to messages that move through your organization. For example, suppose your organizational message size limit is 10 MB, but you configured the users in your marketing department to send and receive messages up to 50 MB.

For messages sent between anonymous senders and recipients (typically, Internet senders or Internet recipients), However, this exemption applies only to messages sent between authenticated senders and recipients (typically, internal senders and recipients). For example, you can allow specific mailboxes to send and receive larger messages than the rest of the organization by configuring custom send and receive limits for those mailboxes. Message size limits for your organization. Therefore, you can configure specific senders and recipients to exceed the default Recipient limits between authenticated senders and recipients (typically, internal message senders and recipients) are exempt from the organizational message size restrictions. There wasn't much help or guidence on this topic on the technet website.