Ban graphical email clients. Everyone must move to a 100% text-based email client option (Mutt, Pine, et al) and there will be no support for any live links within a message - the user must copy and paste any URL manually into their browser. Any attachments must be manually saved with no opportunity to "automatically open" and only a secure archival/compression format may be used (to be developed...) which will double check for invalid filenames (MySuperPicCollection.jpg.exe) and content.
Next, ALL ISPs must block port 25 from non-business users and business users must install proxy and firewall software that includes outbound traffic control.
The only way to resolve this is to eliminate the opportunity for uneducated users to make the wrong choice.
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