Moved away from Gmail, to a big part because of that. Almost did not get my current job because the spamfilter blocked the mails of my future boss to me, after some month of email ping-pong to get all the documents sorted out. I thought they were not interested anymore. They thought I were not interested anymore, since I stopped replying.
so you 'ping-ponged' for some time and suddenly emails from your future boss became spam?
If the answer is yes, is it viable to sue Gmail of lost business/job?
p.s. if talking about the topic, I have also seen quite drastic measures on emails which are not Google's and pray to god if you CC bunch of GMail addresses. You can be flagged as spam, phishing or whatever pretty quick.