# create password
doveadm pw -s MD5-CRYPT -p admin | sed 's/{MD5-CRYPT}//'

chown -R mail:mail /var/lib/vmail/
chown -R postfix /var/lib/postfix/



spamassassin ? rspamd \

# start apps
/ # opendkim
/ # dovecot
/ # syslogd
/ # postfix start


# useful documents
https://www.linode.com/docs/guides/configure-spf-and-dkim-in-postfix-on-debian-9/
https://github.com/postfixadmin/postfixadmin/blob/master/DOCUMENTS/Postfix-Dovecot-Postgresql-Example.md
https://doc.dovecot.org/configuration_manual/howto/postfix_and_dovecot_sasl/
https://wiki.archlinux.org/title/Virtual_user_mail_system_with_Postfix,_Dovecot_and_Roundcube

# do some checking
postmap -q esin.io proxy:pgsql:/etc/postfix/pgsql/virtual_alias_maps.cf
postmap -q hi@esin.io proxy:pgsql:/etc/postfix/pgsql/virtual_mailbox_maps.cf

# dkim
https://www.cnblogs.com/MYue/p/8205439.html