alt Hacker NewsStep zero. Never disclose your email address to anyone.
This is very easy and straightforward. I operate 6 Gmail accounts, and three are "alts" where I've basically never given the address out to anyone at all, and they receive zero spam, zero UCE, zero marketing emails.
Of course, on my "main" I've disclosed the address to many entities and I use it for sign-in and shipping and many things. And yes, I do receive spam and scam emails there, but wcyd?
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I feel like an easier solution to having six different email addresses is to use Gmail aliases - I've caught a few less-than-honest companies either selling my email address, or been breached without disclosing such, simply by using an alias along the lines of '+service_name'. If any alias starts to receive spam you can setup rules to automatically delete everything that comes in with that. You also get the added benefit of significantly easier and more accurate search.
I receive at least a dozen spam emails every day, sometimes as many as 60.
Rarely does more than one per day show up in my main inbox.
Why should I care who has my email address?
I might be missing something, but if you’ve never given them out to anyone at all, then what’s the point?
I recently had a "role" Google account terminated because I was (paraphrasing) "violating Google policies" by having multiple accounts. I didn't know they were sticklers about that.
(I don't much care because the account was just used for interacting with somebody else's Google-hosted junk but, if I had been using it for something serious, I have probably been frustrated.)