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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.
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 smtp_proxy.ini in the following keys:
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enable_outbound=[true]
SMTP proxy outbound messages (set to false to enable Haraka's separate Outbound mail routing (MX based delivery)).
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host=HOST
The host to connect to.
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port=PORT
The port to connect to.
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connect_timeout=SECONDS
The maximum amount of time to wait when creating a new connection to the host. Default if unspecified is 30 seconds.
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timeout=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.
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max_connections=NUMBER
Maximum number of connections to create at any given time.
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enable_tls=[true|yes|1]
Enable TLS with the forward host (if supported). TLS uses options from the tls plugin.
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auth_type=[plain|login]
Enable PLAIN or LOGIN SMTP AUTH. This is required to enable AUTH.
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auth_user=USERNAME
SMTP AUTH username to use.
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auth_pass=PASSWORD
SMTP AUTH password to use.