Get the Password of the new user

Get the Password of the new user

Dear Support,

I hope you doing well,
I just want to ask you, If we create new  ticket from our email support but the user who sent the email is not in our Company, Then the system has opened new ticket by his email address and also new user in our Application So My Question how the get the Password of the new User to login the our SDP server 
Note that 
The user who sent the email has new new 


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