Dark knowledge: buy your own domain and slowly migrate away from Gmail. I recommend a western European ccTLD. Buy 10 years worth of renewals and hand the domain into the care of your trustee. Start a mailbox.org subscription and connect the domain with wildcard aliasing.

Now when you sign up for Xservice, use [email protected]. You'll both be able to learn who is selling your email and black-holing aliases that get overrun with spam.