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---
title: smtpd.conf
description: OpenSMTPD templates
tags:
- OpenBSD
---
## 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 :
```cfg
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"
```
## Primary mx
Here is my primary mx configuration as a sample :
```cfg
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
```
## Secondary mx
Here is my secondary mx configuration as a sample :
```conf
pki adyxax.org cert "/etc/ssl/myth.adyxax.org.crt"
pki adyxax.org key "/etc/ssl/private/myth.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
listen on egress tls pki adyxax.org filter { check_dyndns, check_rdns, check_fcrdns }
listen on socket filter dkimsign
listen on lo0 filter dkimsign
action "local_mail" mbox alias <aliases>
action "relay_to_yen" relay backup tls
match from any for domain <domains> action "relay_to_yen"
match from local for local action "local_mail"
```
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