How do I change the address the mail is sent from for email notifications?

[Esteban Torres Rodriguez]

I'm trying to do this but I do not work.

http://support.nagios.com/knowledgebase/faqs/index.php?option=com_content&view=article&id=52&catid=35&faq_id=338&expand=false&showdesc=true

Does anyone help me?
I've tried to do with mailx but does not work either.

-- 
##################################################
# Esteban Torres Rodríguez                       #
# Área de Soporte Técnico                        #
# Subdirección de Sistemas Informáticos          # 
# Empresa Pública Desarrollo Agrario y Pesquero  #
# email: etorres at dap.es                          #
##################################################


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