Can anyone help me by giving your postfix configuration file as a reference so that I can find my mistakes? I'm working on SUSE Linux Enterprise Server. My goal is to set up a mailserver in a campus network. Postfix shows it is running but no mail is sent to var/spool/mail

I send mail using mail command at terminal. Here is my main.cf file, please help me finding a solution:

readme_directory = /usr/share/doc/packages/postfix-doc/README_FILES
inet_protocols = all
biff = no
mail_spool_directory = /var/mail
canonical_maps = hash:/etc/postfix/canonical
virtual_alias_maps = hash:/etc/postfix/virtual
virtual_alias_domains = hash:/etc/postfix/virtual
relocated_maps = hash:/etc/postfix/relocated
transport_maps = hash:/etc/postfix/transport
sender_canonical_maps = hash:/etc/postfix/sender_canonical
masquerade_exceptions = root
masquerade_classes = envelope_sender, header_sender, header_recipient
myhostname = cmail.cetmail
delay_warning_time = 1h
message_strip_characters = \0
program_directory = /usr/lib/postfix
inet_interfaces = all
#inet_interfaces = 127.0.0.1
masquerade_domains = cetmail 
mydestination = cmail.cetmail, localhost.cetmail, cetmail
defer_transports = 
mynetworks_style = subnet
disable_dns_lookups = no
relayhost = postfix
mailbox_command = cyrus
mailbox_transport = 
strict_8bitmime = no
disable_mime_output_conversion = no
smtpd_sender_restrictions = hash:/etc/postfix/access
smtpd_client_restrictions = 
smtpd_helo_required = no
smtpd_helo_restrictions = 
strict_rfc821_envelopes = no
smtpd_recipient_restrictions = permit_mynetworks,reject_unauth_destination
smtp_sasl_auth_enable = no
smtpd_sasl_auth_enable = no
smtpd_use_tls = no
smtp_use_tls = no
alias_maps =  hash:/etc/aliases

mailbox_size_limit = 0
message_size_limit = 10240000