> > We need a way to specify a second relay if the first does not answer.
>
> This is exactly what MX records are for.
>
> On the internal server specify something like
> #main.cf
> relayhost = gateway.example.com
>
> and arrange for appropriate MX records for gateway.example.com.
> These can be private .local addresses, or an internal-only view.
>
> Alternately, use
> relayhost = [gateway.example.com]
> smtp_fallback_relay = [gatew2.example.com]
>
> This doesn't prevent you from using a customized transport, but it
> does assume SMTP.
**Internal view** That was it! Thanks!
Except for the [transport] with default_transport where do relayhost and
default_transport differ in that scenario? Especially if I can also set
relay_transport...
Does it cycle through the 2 A/MX records (IPs) when trying to deliver? Does it
try both on each try or does it try one, wait, two, wait, one, ...
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