SBS server 2011 - 10Mb+ emails not coming in

I have a client that needs to receive emails often of above 10MB but something is not allowing them to come in.
I have checked the mailbox limits on each user which are unticked to allow any size.

Any help would be most grateful..?
scratcheIT ConsultantAsked:
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Try to send an 11+MB attachment from gmail to the client's email and then examine/post the NDR (delivery failed message) (without the base64 encoded attachment)

this will give you a good place to start looking.

Also, be sure to check the attachment size and other limits, mailbox size is not the only one

see here:

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Lee W, MVPTechnology and Business Process AdvisorCommented:
You need to change the message size limits in several areas.  Global Transport Configuration, Receive Connector, Send Connector.
scratcheIT ConsultantAuthor Commented:
both solutions pointed me into the correct direction and have now resolved the issue.
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