When set to Unlimited (which once was the default values in Exchange 2007 RTM), no limit will be imposed. Valid range for this setting is anywhere in the range between 64KB and 2GB or Unlimited. Set-TransportConfig –MaxReceiveSize 25MB –MaxSendSize 25MBĪs you might expect, MaxReceiveSize applies to receive connectors, MaxSendSize applies to send connectors. If you require a higher value, for example to enable people to send and receive larger attachments, you can use the EMC or Set-TransportConfig: Of course, you can also view the settings using the Exchange Management Shell using Get-TransportConfig, e.g.Īs you can see, the default value in Exchange 2010 is 10240 (10 MB) for both receive as well as send message sizes. The message size limits on the organization level can be set through the Exchange Management Console via Organization Configuration > Hub Transport > Global Settings by opening the Properties of Transport Settings: It’s a waste of resources to accept a message, send it throughout the organization via several hops, to finally reject the message because the recipient has a maximum receive size limit.
Strategy is to define limits where appropriate and as soon as possible. Exception is the individual setting which can override the other settings for internal messages. In general, the lowest size limit on an e-mail route determines if a message can be successfully transported from sender to the recipient. The path evaluated is as follows: User Send Limit > Receive Connector > Organization Checks > Send Connector > User Receive Limit One of these limits is the message size limit, which can be set on the following levels: While traveling trough your Exchange organization or beyond, e-mail messages may be imposed to all sorts of limitations.