How to protect myself from spam?

A few days ago I received some registration and notification mails from a few different dating sites, I've never signed up for. One of them being match.com.

Surprisingly all of them came through Google's spam filter system, so it seems like some service I used before, sold user data to them and now they're bumping up their userbase with "real" fake users.

I already marked all these mails as spam and unsubscribed via Gmail.

Is there anything I can do …

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