inet_interfaces = all
inet_protocols = all
mynetworks_style = host
mynetworks = 127.0.0.0/8
myhostname = server.example.com
mydomain = example.com
myorigin = $mydomain
smtpd_banner = $myhostname ESMTP
mydestination = localhost, localdomain, localhost.localdomain
append_dot_mydomain = no
append_at_myorigin = yes
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
biff = no
recipient_delimiter = +
mailbox_size_limit = 0
mailbox_command = procmail -a "$EXTENSION"

smtpd_helo_required = yes

smtpd_helo_restrictions = permit_mynetworks,
			permit_sasl_authenticated,
			reject_invalid_helo_hostname

smtpd_sender_restrictions = reject_non_fqdn_sender,
			reject_unknown_sender_domain,
			permit_mynetworks,
			permit_sasl_authenticated

smtpd_recipient_restrictions = reject_non_fqdn_recipient,
			reject_unknown_recipient_domain,
			permit_mynetworks,
			permit_sasl_authenticated,
			reject_unauth_destination,
			reject_unlisted_recipient,
			permit

smtpd_data_restrictions = reject_multi_recipient_bounce,
			reject_unauth_pipelining