URI: 

       Title: Configuration of OpenSMTPD to relay mails to outbound smtp
       server
       Author: Solène
       Date: 06 September 2018
       Tags: openbsd70 openbsd opensmtpd highlight
       Description: 
       
       In this article I will show how to configure OpenSMTPD, the default
       mail server
       on OpenBSD, to relay mail sent locally to your smtp server. In pratice,
       this
       allows to send mail through "localhost" by the right relay, so it makes
       also
       possible to send mail even if your computer isn't connected to the
       internet.
       Once connected, opensmtpd will send the mails.
       
       All you need to understand the configuration and write your own one is
       in the
       man page [smtpd.conf(5)](http://man.openbsd.org/smtpd.conf). This is
       only a
       highlight on was it possible and how to achieve it.
       
       In OpenBSD 6.4 release, the configuration of opensmtpd changed
       drasticaly, now
       you have to defines rules and action to do when a mail match the rules,
       and you
       have to define those actions.
       
       In the following example, we will see two kinds of relay, the first is
       through
       smtp over the Internet, it's the most likely you will want to setup.
       And the
       other one is how to relay to a remote server not allowing relaying from
       outside.
       
       **/etc/mail/smtpd.conf**
       
           table aliases file:/etc/mail/aliases
           table secrets file:/etc/mail/secrets
           listen on lo0
dataswamp.org:70 /~solene/article-openbsd-opensmtpd-relay:42: port field too long