I think you will need to play with maximum registry of the system.
You should simply open registry editor on your system and go for below mentioned registry key.
Code:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeIS\ParametersSystem\MaxObjsPerMapiSession\objtAttachment
objtAttachment registry value can be configured with any possible value. If you have manually added and configured any value then it would indicate maximum number of attachments on single email message for MAPI client. in case MAPI client trying to exceed total number of attachment when sending message then an error message can occur.
I let you know that you will not be able to do this particular thing for every single user but you can implement the same on server. for your information maximum number of attachment is 1024.
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