The message might contain many smaller attachments that greatly increase its overall size. For example, if you specify a maximum message size value of 64 MB, you can expect a realistic maximum message size of approximately 48 MB.Īttachment size limits: Specifies the maximum size of a single attachment in a message. Base64 encoding increases the size of the message by approximately 33%, so the value you specify should be approximately 33% larger than the actual message size you want enforced. This accounts for the Base64 encoding of attachments and other binary data. The size of the message can change because of content conversion, encoding, and transport agent processing.įor any message size limit, you need to set a value that's larger than the actual size you want enforced. Whenever the message size is checked, the lower value of the current message size or the original message size header is used. Exchange uses the custom X-MS-Exchange-Organization-OriginalSize: message header to record the original size of the message as it enters the Exchange organization.
Whole message size limits: Specifies the maximum size of a message, which includes the message header, the message body, and any attachments. The following list describes the basic types of message size limits, and the message components that they apply to. This topic provides guidance to help you answer these questions and to apply the appropriate message size limits in the appropriate locations. What is the mailbox quota for my organization, and how do the message size limits that I have chosen relate to the mailbox quota size?Īre there users in my organization who need to send or receive messages that are larger than the maximum allowed size?ĭoes my organization include other messaging systems or separate business units that require different message size limits? 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. You can apply limits to messages that move through your organization.
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