This plugin delivers to another mail server. This is a common setup when you want to have a mail server with a solid pedigree of outbound delivery to other hosts, and inbound delivery to users.
In comparison to
queue/smtp_forward, this plugin makes a connection at
MAIL FROM time to the ongoing SMTP server. This can be a benefit in that
you get any SMTP-time filtering that the ongoing server provides, in
particular one important facility to some setups is recipient filtering.
However be aware that other than connect and HELO-time filtering, you will
have as many connections to your ongoing SMTP server as you have to Haraka.
Configuration is stored in this file in the following keys:
SMTP proxy outbound messages (set to false to enable Haraka's separate Outbound mail routing (MX based delivery)).
The host to connect to.
The port to connect to.
The maximum amount of time to wait when creating a new connection to the host. Default if unspecified is 30 seconds.
The amount of seconds to let a backend connection live idle in the proxy pool. This should always be less than the global plugin timeout, which should in turn be less than the connection timeout.
Maximum number of connections to create at any given time.
Enable TLS with the forward host (if supported). TLS uses options from the tls plugin.
Enable PLAIN or LOGIN SMTP AUTH. This is required to enable AUTH.
SMTP AUTH username to use.
SMTP AUTH password to use.