Added opensmtpd article

content/docs/openbsd/smtpd.md

@@ -0,0 +1,60 @@
+---
+title: smtpd.conf
+description: OpenSMTPD templates
+---
+
+## Simple relay
+
+Here is my template for a simple smtp relay. The host names in the outbound action are to be customized obviously, and in my setups `yen` the relay destination is only reachable via wireguard. If not in such setup, smtps with authentication is to be configured :
+
+{{< highlight conf >}}
+table aliases file:/etc/mail/aliases
+
+listen on socket
+listen on lo0
+
+action "local_mail" mbox alias <aliases>
+action "outbound" relay host "smtp://yen" mail-from "root+phoenix@adyxax.org"
+
+match from local for local action "local_mail"
+match from local for any action "outbound"
+{{< /highlight >}}
+
+## Primary mx
+
+Here is my primary mx configuration as a sample :
+
+{{< highlight conf >}}
+pki adyxax.org cert "/etc/ssl/yen.adyxax.org.crt"
+pki adyxax.org key  "/etc/ssl/private/yen.adyxax.org.key"
+
+
+filter "dkimsign"   proc-exec "filter-dkimsign -d adyxax.eu -d adyxax.org -s 2020111301 -k /etc/mail/dkim/private.key" user _dkimsign group _dkimsign
+filter check_dyndns phase connect match rdns     regex { '.*\.dyn\..*', '.*\.dsl\..*' }  disconnect "550 no residential connections"
+filter check_rdns   phase connect match !rdns    disconnect "550 no rDNS is so 80s"
+filter check_fcrdns phase connect match !fcrdns  disconnect "550 no FCrDNS is so 80s"
+
+
+table aliases  file:/etc/mail/aliases
+table domains  file:/etc/mail/domains
+table virtuals file:/etc/mail/virtuals
+
+
+listen on egress tls   pki adyxax.org  filter { check_dyndns, check_rdns, check_fcrdns }
+listen on egress port  submission tls-require pki adyxax.org auth filter dkimsign
+listen on socket
+listen on lo0
+listen on wg0 filter dkimsign  # if you need to relay emails from your wireguard to the internet like I do
+
+
+action "local_mail" mbox alias <aliases>
+action "cyrus"      lmtp "/var/run/cyrus/socket/lmtp" virtual <virtuals>
+action "outbound"   relay
+
+
+match  from any     for domain <domains> action "cyrus"
+match  from local   for local action "local_mail"
+
+match from any   auth  for any action "outbound"
+match from mail-from "root+phoenix@adyxax.org" for any action "outbound"  # if you need to relay emails from another machine to the internet like I do
+{{< /highlight >}}