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Incoming mail size restrictions on Exchange 2010, SBS 2011

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I have a client who wants to be able to receive messages up to 20MB in size.  They are running Exchange 2010 on an SBS 2011 box.  I have checked every setting I can find to alter the incoming mail size limits, but the server still rejects messages that are larger than 10 MB.  Below are the steps I have already taken.  What am I missing?

Set-TaransportConfig -MaxSendSize 20MB -MaxReceiveSize 20MB
Set-ReceiveConnector "All Receive Connectors" -MaxMessageSize 20MB
Set-SendConnector "All Send Connectors" -MaxMessageSize 20MB
Set-Mailbox "All Mailboxes" MaxSendSize 20MB -MaxReceiveSize 20MB

I also seem to remember changing an EMS item dealing directly with attachment size limits as well, but I can't seem to find the exact command I ran.  Below is the NDR message that I get when trying to send an email of 15MB.  Any assistance would be much appreciated.

This is a Mail server at mail.server.net

Your message could not be delivered to the following address: <photo@companyname.com>

(Unified Log Code: 6221761824, 0001)
from <myaddress@mycompany.com>
to <photo@companyname.com>
66.215.133.174 failed after I sent the message. STARTTLS proto=TLSv1; cipher=AES128-SHA.
Remote host said: 552 5.3.4 Message size exceeds fixed maximum message size


--- Below this line is a copy of the message.

Received: (qmail 18531 invoked from network); 10 Nov 2011 18:24:27 -0000
Received: from unknown (HELO mail-is-05.app.dca.reflexion.local) (10.81.14.5)
by 0 (rfx-qmail) with SMTP; 10 Nov 2011 18:24:27 -0000
Received: by mail-is-05.app.dca.reflexion.local
(Reflexion email security v6.60.1) with SMTP;
Thu, 10 Nov 2011 13:24:27 -0500 (EST)
Received: (qmail 19311 invoked from network); 10 Nov 2011 18:24:19 -0000
Received: from unknown (HELO asp.reflexion.net) (69.84.129.240)
by 0 (rfx-qmail) with (DHE-RSA-AES256-SHA encrypted) SMTP; 10 Nov 2011 18:24:19 -0000
Received: (qmail 31294 invoked from network); 10 Nov 2011 18:24:15 -0000
Received: from unknown (HELO mail-cs-03.app.dca.reflexion.local) (10.81.19.3)
by 0 (rfx-qmail) with SMTP; 10 Nov 2011 18:24:15 -0000
Received: by mail-cs-03.app.dca.reflexion.local
(Reflexion email security v6.60.1) with SMTP;
Thu, 10 Nov 2011 13:24:15 -0500 (EST)
Received: (qmail 16412 invoked from network); 10 Nov 2011 18:22:45 -0000
Received: from unknown (HELO svr-sbs03-dc01.CMPN.local) (163.243.157.68)
by 0 (rfx-qmail) with SMTP; 10 Nov 2011 18:22:45 -0000
X-MimeOLE: Produced By Microsoft Exchange V6.5
Content-class: urn:content-classes:message
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="----_=_NextPart_001_01CC9FD5.B6A219DB"
Subject: 15 MB test
Date: Thu, 10 Nov 2011 10:20:49 -0800
Message-ID: <0D0CD092C866594A86684F61A07132D6EF59B0@svr-sbs03-dc01.CMPN.local>
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
Thread-Topic: 15 MB test
Thread-Index: Acyf1XNM5s15ytcyTIShiH+m+AX8kQ==
From: "My Name" <myname@mycompany.com>
To: <photo@companyname.com>
X-Rfx-Message-Id: 1896820182/6221761824/0001
X-Rfx-Recipient-Address: photo@companyname.com
X-Rfx-Filter-Score: score="1 (1/na)"; threshold="MEDIUM(75)"; result="OK"
X-Rfx-Filter-Score-Summary:
1,0,0,,d41d8cd98f00b204,myname@mycompany.com,photo@companyname
.com,RULES_HIT,0,RBL:69.84.129.240:@mycompany.com:.lbl8.mailshell.net-6
2.0.0.75
64.201.201.201,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,Do
mainCache:0,MSF:not bulk,SPF:fu,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0

This is a multi-part message in MIME format.

------_=_NextPart_001_01CC9FD5.B6A219DB
Content-Type: multipart/related;
boundary="----_=_NextPart_002_01CC9FD5.B6A219DB";
type="multipart/alternative"

------_=_NextPart_002_01CC9FD5.B6A219DB
Content-Type: multipart/alternative;
boundary="----_=_NextPart_003_01CC9FD5.B6A219DB"

------_=_NextPart_003_01CC9FD5.B6A219DB
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: quoted-printable

Fingers crossed=21

=20
Comment
Watch Question

Hey,

There is some links which will help you:

http://exchangepedia.com/2007/09/exchange-server-2007-setting-message-size-limits.html - Explains how to do it;
http://technet.microsoft.com/en-us/library/bb124345.aspx - Explains everything about Message Limits.

Let me know if it helped you.
There is one more:

http://zahirshahblog.com/2010/05/25/25-may-2010-1716/


Let me know if it helped you.
Dan ArseneauDevOps Engineer

Commented:
Do you have something in front of your email system?  ie.  "Reflexion email security v6.60.1".  Check there.
Other thing to keep eye on is:

MIME CONVERSION - There is scenarios which you must get a higher receive limit because some messages get bigger when you receive.

E.g: Once i was in a customer which needed to send and receive messages with maximum of 20MB, then everysingle message we tested had attachment of only 15MB and we received a NDR saying that messages were bigger than our limit.

So define you message limits and do some tests to know the right size of your message limits.
Thank you, Amon.  All of the settings suggested by these articles I have already updated, but still cannot receive mail over 10 MB.  I will attempt to set all of these settings to 30MB and test again; will let you know as soon as I do if that worked.

Dan, yes there is a smart host, but they are set to allow messages larger than 20MB through by default.
Thank you, Amon!  I set the limits to 30MB, reset the Exchange Transport service, and sent a 17 meg file that went through fine.

Have a fantastic week!