[exim] How can I discard specific account

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Lähettäjä: 宇翔
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Vastaanottaja: exim-users
Aihe: [exim] How can I discard specific account
Happy new year :)

If my exim have account id :john
I had change /etc/shadow expire time colum about john ,
and also i wanna discard anyone who wanna mail to john
where should i set in configure file
thanks a lot :)