I believe you can insert dots as you wish but not use it like the plus sign. So abc@gmail.com is the same as a.b.c@gmail.com but abc.new@gmail.com is another ac

I believe you can insert dots as you wish but not use it like the plus sign. So abc@gmail.com is the same as a.b.c@gmail.com but abc.new@gmail.com is another account than abc@gmail.com.