OpenSMTPD configuration

smtpd.conf

# opensmtpd smtpd.conf
#
# Current version:
# https://github.com/OpenSMTPD/OpenSMTPD/issues/1171#issuecomment-1139450955
#
# Installed additional packages:
# debhelper libdb-dev libpam0g-dev libevent-dev bison
#
# Also note: /etc/smtpd created by hand.

srvname="INSERT_SERVER_NAME"
srvaddr="INSERT_SERVER_ADDR"

pki $srvname cert "/etc/smtpd/mail.crt"
pki $srvname key  "/etc/smtpd/mail.key"

table creds  "/etc/smtpd/creds"
table vdoms  "/etc/smtpd/vdoms"
table vusers "/etc/smtpd/vusers"

# Requires: opensmtpd-filter-dkimsign
filter "dkimsign" proc-exec "filter-dkimsign -d INSERT_SERVER_HOST -s mail -k /etc/smtpd/mail.key" user _dkimsign group _dkimsign

listen on $srvaddr port 25 tls pki $srvname hostname $srvname filter "dkimsign"
#listen on $srvaddr port 465 smtps mask-src pki $srvname auth <creds> filter "dkimsign"
listen on $srvaddr port 587 tls-require mask-src pki $srvname auth <creds> filter "dkimsign"

action recv maildir "~/Maildir" virtual <vusers>
action send relay

match from any for domain <vdoms> action recv
match from auth for any action send