postfix config for local mail delivery in MacOS

main.cf

queue_directory = /private/var/spool/postfix
command_directory = /usr/sbin
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
mail_owner = _postfix
inet_interfaces = $myhostname, localhost
mydestination = $myhostname, localhost.$mydomain, localhost
unknown_local_recipient_reject_code = 550
debug_peer_level = 2
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
newaliases_path = /usr/bin/newaliases
mailq_path = /usr/bin/mailq
setgid_group = _postdrop
html_directory = /usr/share/doc/postfix/html
manpage_directory = /usr/share/man
sample_directory = /usr/share/doc/postfix/examples
readme_directory = /usr/share/doc/postfix
dovecot_destination_recipient_limit = 1
mailbox_size_limit = 0
smtpd_tls_exclude_ciphers = SSLv2, aNULL, ADH, eNULL
tls_random_source = dev:/dev/urandom
imap_submit_cred_file =
use_sacl_cache = yes
mydomain_fallback = localhost
message_size_limit = 10485760
biff = no
mynetworks = 127.0.0.0/8, [::1]/128
smtp_use_tls=yes
smtpd_client_restrictions = permit_mynetworks permit_sasl_authenticated permit
recipient_delimiter = +
smtpd_tls_ciphers = medium
inet_protocols = all
inet_interfaces = loopback-only