Default settings
Organization Level
Get-TransportConfig fl max*
MaxDumpsterSizePerStorageGroup : 18MB
MaxDumpsterTime: 7.00:00:00
MaxReceiveSize: 10MB
MaxRecipientEnvelopeLimit : 5000
MaxSendSize : 10MB
Mailboxes: Simon and Tam
('simon','tam') get-mailbox fl name,max*
Name : simon
MaxSafeSenders :
MaxBlockedSenders :
MaxSendSize : unlimited
MaxReceiveSize : unlimited
Name : TAM
MaxSafeSenders :
MaxBlockedSenders :
MaxSendSize : unlimited
MaxReceiveSize : unlimited
Simon cannot send a message to TAM with an attachment over 10MB.
('simon','tam') set-mailbox -MaxSendSize 80MB
('simon','tam') set-mailbox -MaxReceiveSize 80MB
Simon can send a message to TAM with an attachment size of 20MB, even though the Organizational Message Size limit is still 10MB.
Within the same site, there is no Maximum Message Size limit defined. By setting up limit on individual maibox, you create the exception to Organizational Limit of Maximum Message Size.
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By default, Exchange 2007 does not impose a maximum message size limit on messages that are relayed between Hub Transport servers in different Active Directory sites or across routing group connectors to Legacy Exchange servers.
Set-AdSiteLink -Identity DEFAULTIPSITELINK -MaxMessageSize 10MB
