An important step would be to limit the time frame of emails covered by the warrant. I dissected the article hoping this would be mentioned but it wasn't.
There are many more limiting factors that can be applied: the sender/recipient being a critical one for me. Why should the government get access to all the emails you send your significant other? In some states there are even laws against that that such a blanket order would circumvent. If the government thinks that he was using email to facilitate the transfer, it should name the parties and their emails and get only the emails between those two parties.
