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How do I increase my attachment size limit in Exchange 2010?

I just received the following message from my Exchange server -

"This message is larger than the size limit for messages. Please make it smaller and try sending it again."

It is only 4mb.  I have tried increasing the threshold in various places on my server but obviously not the right place.

Could somebody please tell me EXACTLY where I need to do this.  I want to increase it to 30mb.
2 Solutions
you basically need to increase it in 3 places

1. org config  > hub transport -> Transport settings
2. org config > hub transport > send connectors
3. server config > hub transport > receive connector

after you finish you might want to restart the transport service for it to kick in
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Setting Message Size Limits in Exchange 2010 and Exchange 2007

1. Modify  Global settings
Organization Configuration->Hub Transport->Global Settings->Properties of Transport Settings
Modify   transport send/receive limits.

2. Modify Send Connector
Organization Configuration->Hub Transport->Send Connectors->Properties of Default Send
Modify send connectors default maximum message size

3. Receive Connector
Server Configuration->Hub Transport->Receive Connectors Pane->Properties of Default <hostname>

- Rancy
Modify receive connectors default maximum message size
djsharmaTechnical ConsultantCommented:
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fuzzyfreakAuthor Commented:
Thanks guys, I should really have included the exact message that prompted my question because it now appears that I can send it and all I did was increase one of those thresholds from 30mb to 50mb which would not have made a difference (I also did not restart transport service).

Delivery has failed to these recipients or groups:

This message is larger than the size limit for messages. Please make it smaller and try sending it again.

Diagnostic information for administrators:

Generating server: server.domain

#554-5.3.4 Content conversion limit(s) exceeded 554 5.3.4 STOREDRV.Submit.Exception:ConversionFailedException; Failed to process message due to a permanent exception with message The content conversion limit has been exceeded. ConversionFailedException: The content conversion limit has been exceeded. ##

Original message headers:

Received: from server.domain ([fe80::4ba8:eb6d:f983:6699]) by
 server.domain ([fe80::4ba8:eb6d:f983:6699%12]) with mapi id
 14.02.0328.009; Tue, 15 Jan 2013 10:12:02 +0000
MIME-Version: 1.0
Content-Type: text/plain
Date: Tue, 15 Jan 2013 10:12:02 +0000
Message-ID: <E385FBA95DB2AF42AE88C2FD549DCAAE378374@server.domain>
Subject: [#3631147]]
fuzzyfreakAuthor Commented:
Sorry, further to this, the file itself is zipped to 4mb but is actually 60mb in size (uncompressed) I believe this must have had something to do with the problem sending it.
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Also to add if you send email externally the size of the Email increases to 130-135% so if you send a 10MB email it will check with the limit which should be 10+35% if not will fail

- Rancy
fuzzyfreakAuthor Commented:
The e-mail went, so I must have resolved it by increasing the threshold.
fuzzyfreakAuthor Commented:
Thank you both for your fully comprehensive answers.
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