I use a unique email address for every account I create on my domain. My provider (runbox) is so good at spam filtering, I can't tell if using unique emails has

I use a unique email address for every account I create on my domain. My provider (runbox) is so good at spam filtering, I can't tell if using unique emails has benefited me in any way. The only address that ever gets spam is the one I put on my homepage in plaintext. And I've been doing this for 12 years. Spam filtering is kinda amazing, but it hides the reality that I was trying to measure.