According to a recent announcement, Gmail will start blocking .js file attachments starting February 13, 2017.
This move does beg the question as to why not force all attachments to go through a storage service, rather than directly attached to the email. Would that actually create a larger risk with the abundance of links now being sent within emails? Would it just move the threat from your inbox to the cloud service? It would be interesting to get a bigger picture of this landscape for better understanding.
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