How to prevent to write to a recipient

hi, im new using procmail, i want to know how to prevent a user to write 
to a recipient.

example, i want that the user1(_at_)abc(_dot_)com cannot write to 
company(_at_)abc(_dot_)com

can i do that with procmail?

Thanks



-- 
Gustavo Villaran Wiegering
Departamento de Sistemas
Pandero S.A. EAFC
Telf. 4211631 - 835*1159
www.pandero.com.pe


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