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Google Guide is the place to go if you are ever wondering if you can do x in any of its search engines. It will walk you through major Google operators, minor Google operators, and obscure Google operators so you can bring your search to the next level.
This will NOT work for EliApps, but if you are curious about how to filter your email using address dots, this is the place to go for a tutorial. You can use dots in your email to create better search filters and rules for where things go when they are sent to you.