(Tedious disclaimer: my opinion only, not speaking for anybody else. I'm an SRE at Google.) What you want to be thinking is: all of the attachments including m

(Tedious disclaimer: my opinion only, not speaking for anybody else. I'm an SRE at Google.) What you want to be thinking is: all of the attachments including malware. Safebrowsing is an anti-malware system. Large collections of unfiltered email invariably contain malware. (I can't say much more than that, sorry)