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Exchange 2010 large emails are not delivered and no NDR generated

Posted on 2013-11-18
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Last Modified: 2013-11-23
I've recently upgraded our Exchange 2003 to 2010.
We have a 10MB limit for send/receive email size.
I tested to make sure that outside users received an NDR when sending above that limit.

Recently we started getting complaints that some customers send large files, which are never received by our staff, yet customer does not receive NDR.

To address the issue I did following:
- Bumped up transport limit to 30MB
Set-TransportConfig -MaxReceiveSize 30MB -MaxSendSize 30MB

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- Made sure my default site link in AD is set to Unlimited
- Bumped up send connector limit to 30MB
Set-Sendconnector "<Connectorname>" -MaxMessageSize 30MB

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- Bumped up receive connector limit to 30MB
Set-ReceiveConnector -Identity "<connectorname> -MaxMessageSize 30MB

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- Made sure that mailbox limits are set to Unlimited

None of the above worked when sending message with 13MB attachment.

So I tried to create a transport rule which sends NDR if attachment size exceeds 10MB.

This does not work either.

NOTE: Smaller attachments are going through fine.

When sending attachment over 10MB to outside account I get this NDR
Delivery has failed to these recipients or groups:

'gmail.account@gmail.com' (gmail.account@gmail.com) <mailto:gmail.account@gmail.com>
This message is larger than the size limit for messages. Please make it smaller and try sending it again.

The following organization rejected your message: mail.domain.com.

Diagnostic information for administrators:

Generating server: SERVER-NAME.LOCALDOMAIN.local

gmail.account@gmail.com
mail.domain.com #552 5.3.4 Message size exceeds fixed maximum message size ##

Original message headers:

Received: from SERVER-NAME.LOCALDOMAIN.local ([::1]) by
 SERVER-NAME.LOCALDOMAIN.local ([::1]) with mapi id 14.03.0158.001; Mon, 18 Nov
 2013 16:57:35 -0500
From: USER <user@domain.com>
To: "'gmail.account@gmail.com'" <gmail.account@gmail.com>
Subject: Test with 13MB attachment
Thread-Topic: Test with 13MB attachment
Thread-Index: Ac7kqalxyfmRy9zGS1+WOYavLbJR8g==
Date: Mon, 18 Nov 2013 21:57:33 +0000
Message-ID: <33B3E1849A28244E8A2C91781F8994D4AE7988@SERVER-NAME.LOCALDOMAIN.local>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
x-originating-ip: [10.0.0.101]
Content-Type: multipart/mixed;
      boundary="_011_33B3E1849A28244E8A2C91781F8994D4AE7988SERVERNAMEDOMAIN_"
MIME-Version: 1.0
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Question by:Alumicor
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4 Comments
 
LVL 63

Assisted Solution

by:Simon Butler (Sembee)
Simon Butler (Sembee) earned 1500 total points
ID: 39657956
Did you restart the transport service after making the change?
What is between Exchange and the internet? A firewall? Does that scan SMTP traffic?

Simon.
0
 

Author Comment

by:Alumicor
ID: 39658174
Yeh, we have firewall. I confirmed that it allows my test messages with attachments to pass through.
Transport service was restarted and I also rebooted entire server, just in case. Did not help :( .

Not sure if this will help: the way we have this server set up with 2 top level domains.
One .com for outside and internally we have .local .  We had to use 2 web sites in IIS in order to make it work, where default site is for local access and secondary site for external smtp traffic.
0
 

Accepted Solution

by:
Alumicor earned 0 total points
ID: 39658243
Got it figured out.
Firewall port forwarding misconfiguration. SMTP traffic was routed to legacy server.
0
 

Author Closing Comment

by:Alumicor
ID: 39671145
I think that NDR it was showing from Exchange 2010 was somehow generated by old Exchange 2003. Noticed that it was styled as in legacy servers, since 2010 has slightly different look of NDR + your comment made me to review firewall configs.
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