See /usr/share/postfix/main.cf.dist for a commented, more complete version
smtpd_banner = $myhostname ESMTP $mail_name
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
myhostname = abc123.com
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = abc123.com
mydestination = abc123.com
relayhost = 10.69.1.60
mynetworks = 10.69.1.0/24, 10.0.10.0/24, 127.0.0.0/8
mailbox_size_limit = 0
recipient_delimiter =
inet_interfaces = all
message_size_limit = 16000000
local_transport = error:no local mail delivery
local_recipient_maps =
virtual_alias_maps = hash:/etc/postfix/virtual
relay_recipient_maps = hash:/etc/postfix/relay_recipients
#
transport_maps = hash:/etc/postfix/transport
relay_domains = hash:/etc/postfix/transport
smtpd_helo_required = yes
smtpd_client_restrictions = reject_rbl_client dul.dnsbl.sorbs.net, reject_rbl_client sbl.spamhaus.org, reject_rbl_client cbl.abuseat.org, reject_rbl_client list.dsbl.org
smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/sender_access, reject_non_fqdn_sender, reject_unknown_sender_domain
smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination, reject_unauth_pipelining, reject_unknown_recipient_domain, reject_unverified_recipient
unverified_recipient_reject_code = 550
address_verify_map = btree:/var/spool/postfix/verify
header_checks = pcre:/etc/postfix/header_checks
body_checks = pcre:/etc/postfix/body_checks
content_filter = smtp-amavis:[127.0.0.1]:10024
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