you first need to find the account related e-mail adresse login in theyre
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In some case it will be shown.
Once you got the account e-mail address, you only need to crack the e-mail acc, (Smtp ''google'') require a bit more work to crack, hotmail isnt so bad.
Goodluck if it an Smtp doe it took me a lot of time and frustration before i finally found a way to brute force smtp password, it will return with : HTTP 200 Success , then redirect to a page saying that the password is wrong, so basically most of the automated brute-force program will get counter and return you with 'success' result while it hes only tricking you.
If the e-mail server is using Drupal 6 or 7 it wont be too hard, with drupal7, you'l will be able to make 50x attempt /hours , but if it already using Drupal 8 then..good luck
:Edit: oh..ok i see your going to long, hard and dangerous ways lols.. I believe my way is still faster .. after a while youl get used forcing Smtp,Imap and Pop email server