Postfix não envia e-mail !

Ola pessoal, estou configurando o Postfix no Fedora Core 1, estou tendo problemas na hora do envio do e-mail, instalei o Mozzila Mail e estou enviando os e-mails atraves dele, quando envio o e-mail fica na caixa de mensagens enviadas mas não chega ao destinatario.
Ja verifiquei o Firewall q esta tudo liberado!
segue o meu main.cf

queue_directory = /var/spool/postfix

command_directory = /usr/sbin

daemon_directory = /usr/libexec/postfix

mail_owner = postfix

#default_privs = nobody

myhostname = fedora.colegio.local

mydomain = colegio.local

myorigin = $mydomain

inet_interfaces = all

proxy_interfaces =

mydestination = $myhostname, localhost.$mydomain, $mydomain

unknown_local_recipient_reject_code = 450

mynetworks_style = host

mynetworks = 172.16.1.10/24, 127.0.0.0/8
relay_domains = $mydestination

relayhost = $mydomain

alias_maps = hash:/etc/postfix/aliases

home_mailbox = Mailbox

mail_spool_directory = /var/spool/mail

mailbox_transport = lmtp:unix:/file/name

#smtpd_banner = $myhostname ESMTP $mail_name
#smtpd_banner = $myhostname ESMTP $mail_name ($mail_version)

#local_destination_concurrency_limit = 2
#default_destination_concurrency_limit = 10

debug_peer_level = 2

#debug_peer_list = 127.0.0.1
#debug_peer_list = some.domain

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

manpage_directory = /usr/share/man

sample_directory = /usr/share/doc/postfix-2.0.11/samples

readme_directory = /usr/share/doc/postfix-2.0.11/README_FILES
alias_database = hash:/etc/postfix/aliases