Scott A. Wozny:
> In the standard config on an email gateway in
> (http://www.postfix.org/STANDARD_CONFIGURATION_README.html#firewall) the
> proposed config has relay_domains set for example.com and
> transport_maps set to a hash with example.com using
> smtp:[inside-gateway.example.com].

This would 
- Deliver example.com to the inside host.
- Deliver other domains to the outside network.

> My question is, how is this functionally different from setting
> relayhost to [inside-gateway.example.com]?

This would
- Deliver example.com to the inside host.
- Deliver other domains to the inside host.

So they do different things for other domains.

        Wietse

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