I set the properties on the General tab of the Transport Settings Properties window to have a max send & receive size of 50000KB. A client sent me an email with a 4MB attachment that was delivered but a second email with a 9MB attachment was rejected. Why would a 9MB attachment be rejected? Is there somewhere else that I have to set size limits?

This article still applies: http://technet.microsoft.com/en-us/library/bb124345(EXCHG.80).aspx

Hi JohnSLG, There are lots of kinds of limit for Exchange 2010 Message size. Such as global limits, connector limits, server limits and user limits etc. The actual transport size depends on the minimum. So I recommend you check out the above kinds of limits using the following steps: For global limits: you should check out it using Get-TransportConfig, change the maximum message size for messages using the CMDLet: Set-TransportConfig –MaxSendsize For connector limits: you should check out it using Get-ReceiveConnector, change the message size limit using the CMDLet: Set-ReceiveConnector –Identity –MaxMessageSize MessageSizeYouWant For server limits: you could use Get-TransportServer to display all settings on the specific Transport Server. And use Set-TransportServer to change the limit. For user limits: you could use the CMDLet Get-Mailbox –Identity username | List show the mailbox details and the MaxSendSize. If you want to change the settings for the mailbox, using the CMDLet: Set-Mailbox –Identity username –MaxSendSize MessageSizeYouWant For detailed, you can refer the following documents: Set-TransportConfig: http://technet.microsoft.com/en-us/library/bb124151.aspx Set-TransportServer: http://technet.microsoft.com/en-us/library/bb124238.aspx Set-Mailbox: http://technet.microsoft.com/en-us/library/bb123981.aspx Managing Message Size Limits: (Ex2010 is very similar with Ex2007 in managing message size limits) http://technet.microsoft.com/en-us/library/bb124345(EXCHG.80).aspx Exchange 2007 Message Size Limits: http://www.msexchange.org/articles-tutorials/exchange-server-2007/management-administration/exchange-2007-message-size-limits.html If you have any other questions, I am glad to have a further discussion with you. Best regards, Yang

Thanks....