See /usr/share/postfix/main.cf.dist for a commented, more complete version
Debian specific:  Specifying a file name will cause the first
line of that file to be used as the name.  The Debian default
is /etc/mailname.
#myorigin = /etc/mailname
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)<br />
biff = no
appending .domain is the MUA's job.
append_dot_mydomain = no
Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h
readme_directory = no
TLS parameters
smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem<br />
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key<br />
smtpd_use_tls=yes<br />
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache<br />
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
information on enabling SSL in the smtp client.
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination<br />
myhostname = spencer.horde.org<br />
alias_maps = hash:/etc/aliases<br />
alias_database = hash:/etc/aliases<br />
myorigin = /etc/mailname<br />
mydestination = spencer.horde.org, localhost.horde.org, , localhost<br />
relayhost =<br />
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128<br />
mailbox_command = procmail -a "$EXTENSION"<br />
mailbox_size_limit = 0<br />
recipient_delimiter = +<br />
inet_interfaces = all<br />
inet_protocols = all