Exchange 2010 Receive Connector

Trying to get to the bottom of why attachments of c8mb are being bounced back by what seems to be our exchange server(s).
The mail is being received by our cloud mail partner.
Error:

552 5.3.4 Message size exceeds fixed maximum message size      

Exchange receive connectors are set to 10mb.
THere is no attachment size policy in the cloud.

2x Exch SP3 Ud6.

Ideas?
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CHI-LTDAsked:
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Mark GalvinManaging Director / Principal ConsultantCommented:
When you say 8MB its likley that the system is seeing that as too close to 10MB and blocking.

Can you set the connector to be 15mg and see if it gets through?
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CHI-LTDAuthor Commented:
think ive cracked it.
i wanted to know why before i changed settings.

i see attachments increase by 33% so may be why.

will increase transport etc..
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CHI-LTDAuthor Commented:
right, changed what i thought was all i need to change - from 10mb to 25mb.
Not working.  Do i need to restart transport service?

THe internal and external dnsmaxmessageattachsize still showing 10mb...
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Mark GalvinManaging Director / Principal ConsultantCommented:
You should restart the transport service and then check again.
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