Yes, that's my experience too. Gmail spam filters worked perfectly for 10 years or more and then suddenly started letting through 1-2 obvious spam emails per da

Yes, that's my experience too. Gmail spam filters worked perfectly for 10 years or more and then suddenly started letting through 1-2 obvious spam emails per day in the last couple of years. It's always seemed strange to me -- an obvious regression that's trivial for them to detect.