Email flow through the Mailborder Gullekson Virtuoso (GV) engine is handled by a Postfix/Mailborder inet milter and the GV service daemon. The Postfix service is configured to inject all email into the GV engine which then injects it back into Postfix after inspection.
Inbound email is defined as any email arriving via an external source, such as the internet, or via an internal source, such as an internal server using Mailborder as a smarthost.
Email Flow
email in -> Postfix MTA -> Mailborder GV inet milter on localhost:10025 -> hold
hold -> GV engine -> scan -> {send / archive / defer / delay / quarantine / jail / corrupt }
GV engine {send} -> Postfix on localhost:10026 -> delivery queue
Postfix delivery queue -> final delivery
This flow process is accordance with Postfix recommendations and complies to RFC 821 and RFC 822 guidelines.
Safeguards
In the event of a service outage by the Mailborder GV engine, the Postfix MTA will store inbound email until the GV service is restored.
In the event of a service outage by the Postfix MTA, the Mailborder GV engine will store outbound email until the Postfix service is restored.
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