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.
user1@mydomain.com
user2@mydomain.com
user3@mydomain.com
user4@mydomain.com

now i want to block email id : baduser@anotherdomain.com
coming to the email id: user1@mydomain.com (only for this account)
Others should get email from baduser@anotherdomain.com

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.
Thankyou!

Regards,
Manoj