Linux - Problemas con el main.cf de POSTFIX

Hola, tengo problemas para configurar POstfix en mi máquina, tengo Fedora Core 3, logro configurarlo para que reciba correo, pero al momento de ponerlo para recibir, me da problemas. Bajo el sendmail, y al momento de subir postfix, me manda el siguiente error:

postfix: fatal: myorigin parameter setting must not contain multiple values: fi-c.unam.mx inet_interfaces = all

Anexo mi archivo main.cf:

mail_owner = postfix
myhostname=midominio.com
#myhostname = virtual.domain.tld
mydomain = midominio.com
myorigin = $mydomain
#myorigin = $myhostname
#myorigin = midominio.com
inet_interfaces = all
mynetworks_style = host
relay_domains = $mydestination, 127.0.0.1
alias_database = hash:/etc/aliases
home_mailbox = Maildir/
smtpd_banner = $myhostname ESMTP $mail_name
local_destination_concurrency_limit = 2
default_destination_concurrency_limit = 20
debug_peer_level = 2
debugger_command =
PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
xxgdb $daemon_directory/$process_name $process_id & sleep 5
sendmail_path = /usr/sbin/sendmail.postfix
newaliases_path = /usr/bin/newaliases.postfix
mailq_path = /usr/bin/mailq.postfix
setgid_group = postdrop
html_directory = no
manpage_directory = /usr/share/man
sample_directory = /usr/share/doc/postfix-2.1.5/samples
readme_directory = /usr/share/doc/postfix-2.1.5/README_FILES