Inbound SMTP relay with Haraka

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I would like to know if the following scenario is possible to achieve with Haraka (employing existing plugins).

There is a public SMTP server (let’s call it a Gateway) that accepts inbound e-mails sent to any user at *.mail.domain (note the subdomain wildcard) and forwards it to the appropriate SMTP server (let’s call it a Satellite) in the private network. The forwarding is done based on the recipient domain. The satellite servers are dynamic in the sense that they join/leave the private network dynamically so they are not known beforehand.