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If you know all the SMTP domains associated with the mobile devices (i.e., mobile.provider1.com, provider2.com, etc.), one simple solution you may want to try is to restrict the size of messages that can be sent to these domains.
Alternatively, if you have a gateway antivirus scanner, you may be able to apply specific rules to strip attachments sent to specific addresses.
Finally if these are of no avail, you may want to search your favorite Internet search engine for "strip attachments" to find third-party solutions to meet your requirements.
Hope that helps!
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