generate-email.js

var email = "YOU_EMAIL_WITHOUT_GMAIL_GOES_HERE";

var emailList = [];
for(let i = 1; i < email.length - 1; i++){
  for(let x = 1; x <= email.length; x++){
      if(i+1 !== x && i != x) {
          let splitEmail = email.split("");
          splitEmail.splice(i, 0, '.');
          splitEmail.splice(x, 0, '.');
          
          var alreadyExist = emailList.some(email => email === splitEmail.join(""));
          
          if(!alreadyExist)
              emailList.push(splitEmail.join("")); 
      }  
  }
}

document.querySelector("body").innerHTML = emailList;

Please run this core at about:blank

How to use it

• Open a new browser tab and paste this, about:blank
• Press F12
• Copy tis code snippet and past on browser console
• replace the string YOU_EMAIL_WITHOUT_GMAIL_GOES_HERE with your email
• Please Eenter
• That's all, you already have the emails separated by , at the screen