Gmail recently began aggressively spam filtering emails from US government agencies with .gov addresses, as well as .com addresses from major US and multinational corporations. Aside from setting up filters manually, this change is destroying the value proposition of using Gmail for important communications.
What change caused this, and why can't Google be contacted in any communication channel when things break? It's dangerous and irresponsible to spam filter .gov!
It is trivial to send an email with any address you like as the from value. So this may be a response on google's part to the irs scammers (and other 'govt' scamming artists) sending out spam emails with .gov from addresses to give them a fake appearance of authenticity.