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Maximum Message Size in Exchange 2007

Where do I find the setting for Maximum message size in Exchange 2007? We had an email with a 10mb attachment rejected by the Exchange server with the following explaination:

host mail.jcsteele.com[] said: 552
    5.3.4 Message size exceeds fixed maximum message size (in reply to MAIL
    FROM command)

I have three different Exchange 2007 books and none of them address this issue. The Microsoft tech site was no help either.
1 Solution
In order to set the limits at the Org level
use the Exchange Management Shell CMDLet GET-TRANSPORTCONFIG.
then to change the maximum message size for Receive messages

Set-Transportconfig maxreceivesize
 and to allow to set a maximum message size for messages sent to users outside the Exchange organization then run

Set-Transportconfig maxsendsize

this should help you in achieving the required results.

DJKOEPNICKAuthor Commented:
This was exactly what I was looking for.
Here are the results of the command GET-TRANSPORTCONFIG
ClearCategories                : True
DSNConversionMode              : UseExchangeDSNs
GenerateCopyOfDSNFor           : {5.4.8, 5.4.6, 5.4.4, 5.2.4, 5.2.0, 5.1.4}
InternalSMTPServers            : {,}
JournalingReportNdrTo          : <>
MaxDumpsterSizePerStorageGroup : 18MB
MaxDumpsterTime                : 7.00:00:00
MaxReceiveSize                 : 20MB
MaxRecipientEnvelopeLimit      : 5000
MaxSendSize                    : 20MB
TLSReceiveDomainSecureList     : {}
TLSSendDomainSecureList        : {}
VerifySecureSubmitEnabled      : False
VoicemailJournalingEnabled     : True
WritingBrandingInDSNEnabled    : True
Xexch50Enabled                 : True

as you can see it is set to 20mb for send and receive but it still rejects the email.
Here are pertinent results from GET-Mailbox -identity mario | list

DisplayName                          : Mario Cerrato
EmailAddresses                       : {smtp:flexapp@regallending.com, smtp:mar
                                       io@peopleplusresources.com, smtp:mario@c
                                       erratofamily.com, SMTP:mario@regallendin
                                       g.com, smtp:mario@rlg.local}
GrantSendOnBehalfTo                  : {}
HiddenFromAddressListsEnabled        : False
LegacyExchangeDN                     : /o=First Organization/ou=Exchange Admini
                                       strative Group (FYDIBOHF23SPDLT)/cn=Reci
MaxSendSize                          : 20000KB
MaxReceiveSize                       : 20000KB
PoliciesIncluded                     : {}
PoliciesExcluded                     : {{26491cfc-9e50-4857-861b-0cb8df22b5d7}}
EmailAddressPolicyEnabled            : False
PrimarySmtpAddress                   : mario@regallending.com
RecipientType                        : UserMailbox
RecipientTypeDetails                 : UserMailbox
RejectMessagesFrom                   : {}
RejectMessagesFromDLMembers          : {}
RequireSenderAuthenticationEnabled   : False
SimpleDisplayName                    :
UMDtmfMap                            : {}
WindowsEmailAddress                  : mario@regallending.com
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