How do increase the exchange 2013 message size limit above 10mb - 500pnts

How do increase the exchange 2013 message size limit above 10mb

I need to increase the file size that user can receive it appears to be set about 10mb on our exchange server, but I need to increase this to around 25MB

500pnts
Ian PriceIT ManagerAsked:
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Zacharia KurianAdministrator- Data Center & NetworkCommented:
Please note that the Message size limit is different from Attachment size limit.

Message size limits:-  These limits apply to the total size of a message, which includes the message header, the message body, and any attachments. Message size limits may be imposed on incoming messages or outgoing messages. For internal message flow, Exchange uses the custom X-MS-Exchange-Organization-OriginalSize: message header to record the original message size of the message as it enters the Exchange organization. Whenever the message is checked against the specified message size limits, the lower value of the current message size or the original message size header is used.
Attachment size limits:-   These limits apply to the maximum allowed size of a single attachment within a message. The message may contain many attachments that greatly increase the overall size of the message. However, an attachment size limit applies to the size of an individual attachment only.

Modifying attachment size limit by using :

Cmdlets: New-TransportRule, Set-TransportRule  by using  Parameter: AttachmentSizeOver

 Or  by using EAC also :

Mail flow > Rules > Add Add Iconor Edit Edit Icon ,
Use the predicate Apply this rule if > Any attachment > is greater than or equal to
Use the predicate Apply this rule if > The message > size is greater than or equal to

 Once modified restart the Transport service.
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Ian PriceIT ManagerAuthor Commented:
Ok I think it's the message size I need to change how do I do that?

Ian..
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Zacharia KurianAdministrator- Data Center & NetworkCommented:
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Ian PriceIT ManagerAuthor Commented:
Ta
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