pki post key '/etc/ssl/private/post.example.org'
pki mail key '/etc/ssl/private/mail.example.org'
table remote db:/etc/smtpd_remote.db
listen on 192.0.2.15 inet4 port 25 hostname post.example.org tls pki post
listen on 192.0.2.15 inet4 port 587 hostname mail.example.org tls-require pki mail auth <remote> tag remote
listen on 127.0.0.1 inet4 port 25 hostname local.example.org
limit mta inet4