I am looking for an e-mail server/client that does the following:
- Runs as an e-mail server (POP3, IMAP, Exchange, etc) for an isolated network
- Retrieves e-mail from the isolated network
- Resend retrieved e-mail via another account (SMTP, IMAP, Exchange, etc) to the main network
The isolated network cannot directly access (or authenticate on) the regular mail server. I want to put a small mail-server on the regular network which collects e-mail and sends to the regular mail server.
When an e-mail is received, the e-mail server (forwarder, relay, gateway, etc) should resend that message via a different e-mail account.
What would this be called? (ie: an e-mail forwarder, an e-mail relay, an e-mail proxy, e-mail gateway, etc)
NOTE: I'm not asking for specific product recommendations, only the correct terminology.