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
- Made sure my default site link in AD is set to Unlimited
- Bumped up send connector limit to 30MB
Set-Sendconnector "<Connectorname>" -MaxMessageSize 30MB
- Bumped up receive connector limit to 30MB
Set-ReceiveConnector -Identity "<connectorname> -MaxMessageSize 30MB
- 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:
'email@example.com' (firstname.lastname@example.org) <mailto:email@example.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
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 <firstname.lastname@example.org>
To: "'email@example.com'" <firstname.lastname@example.org>
Subject: Test with 13MB attachment
Thread-Topic: Test with 13MB attachment
Date: Mon, 18 Nov 2013 21:57:33 +0000