How to correctly increase the size of sending a file attachement thru exchange 2010

I had this question after viewing Exchange 2010 / Outlook 2010 Mailbox size limits.

I have a few people that are trying to send out file attachments in size of maybe 30 megs or even less and their outlook is telling them that they have reached the allowed size limit in exchange.
James EdwardsSystems ManagerAsked:
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Jeff GloverSr. Systems AdministratorCommented:
If you set a limit on a mailbox, it bypasses the Transport Config (Global) for internal messages (recipient to recipient) only.  there is no built in command to set the default on all mailboxes I know of (someone may know it but I don't. You might be able to  use powershell something like this:
get-mailbox | set-mailbox -maxsendsize <size in MB> -maxreceivesize <size in MB>
If you have more than 1000 mailboxes, you will probably ahve to use the -resultsize unimited swithch on get-mailbox
You might also be able to use a txt file of mailboxes  get-content <path to txt file | set-mailbox -maxsendsize <size in MB> -maxreceivesize <size in MB>

If you want to go the powershell route, I would say use the -whatif command first to make sure it does what you want. As I said earlier, I am using 2013/2016. It has been years since we used 2010. I have never used the above commands but I do use Powershell in Exchange often so they should work.
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viktor grantExchange ServersCommented:
Hi James,

Your Exchange is configured in order not to allow heavy attachement which is good practice in order to avoid backpressure issue.

I suppose you have the same restriction in OWA and Outlook?

Cheers
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Jeff GloverSr. Systems AdministratorCommented:
For all of exchange, you can set the maximum Send size on the Send Connector and the Maximum receive size on the Receive connector. You can also set the maximum size on each mailbox. BTW, 30 MB is large and even if you can send it, the receiving side may reject it.
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James EdwardsSystems ManagerAuthor Commented:
Yes but we have some users that send larger then the default size thru their outlook client and i thought i took care of that but everytime this person tries to send a file attachement he is getting this error. I also went into the registry on the client pc and made changes in it to allow him but he still gets this error and also 2 other people are having the same issue.
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Jeff GloverSr. Systems AdministratorCommented:
Are they sending to an external receiver or internal?
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James EdwardsSystems ManagerAuthor Commented:
i have ran this command on our exchange server and this is the results:
1. Get-TransportConfig |fl max*size
    MaxReceiveSize : 976.6 MB (1,023,998,976 bytes)
    MaxSendSize    : 976.6 MB (1,023,998,976 bytes)
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James EdwardsSystems ManagerAuthor Commented:
They are sending to an internal address.
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Jeff GloverSr. Systems AdministratorCommented:
And you have similar Message size restrictions on the affected user mailboxes?
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James EdwardsSystems ManagerAuthor Commented:
On the person i edited his registry he was able to send out that moment but when he tried a few days later he called back with the same issue.

This is what i edited in the registry:

HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\14.0\Outlook\Preferences

create Value type: DWORD
Value name: MaximumAttachmentSize
Value data: 0
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James EdwardsSystems ManagerAuthor Commented:
Yes that is correct.
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Jeff GloverSr. Systems AdministratorCommented:
ON that persons mailbox, in the EMC, go to properties and see what the Message size restrictions are set to.
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Jeff GloverSr. Systems AdministratorCommented:
If the issue is really exchange, then there are several places it can happen. I use 2013/2016 and have to look back to remember 2010. However, this site has a pretty good overview of message size restrictions and what can cause issues. See if it helps.
https://exchangepedia.com/2007/09/exchange-server-2007-setting-message-size-limits.html
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James EdwardsSystems ManagerAuthor Commented:
Ok in the EMC the message size restrictions on this person is set to 999999kb for sending out.
nothing is checked for receiving.
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Jeff GloverSr. Systems AdministratorCommented:
Is there a receive limit for the person he or she is sending to?
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James EdwardsSystems ManagerAuthor Commented:
Here is the setting of the transport properties under Global Settings

Transport limits:
maxmum receive size: 999999
Maximun send size: 999999
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James EdwardsSystems ManagerAuthor Commented:
Is there a command to set a global limit for all users.
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James EdwardsSystems ManagerAuthor Commented:
Thanks
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