Dear Experts,

I work as system engineer in ISP and i had a problem with qmail.
Actually i want to block incoming email from certain user only for particular email id. So, that others can receive email from that user.]
let me explain by taking example:
I have following email id in my mail server.

now i want to block email id :
coming to the email id: (only for this account)
Others should get email from

My mail server is qmail. What are the changes that i need to do? Please help me.

Hoping to get a quick reply from all the experts.