> 
> The list is expanded before use, so you could build
> it using the domain of the mail recipient.  You will
> have to do the MX lookups...
> 
> http://exim.org/exim-html-current/doc/html/spec_html/ch-the_manualroute_router.html
> 
> 
> Option 2:
> 
> Fiddle with "condition = ${if first_delivery}" on
> the smarthost router and the inverse on the
> backup.  Have a shortish initial retry time
> (see both Retry Rules *and* the queue-runner
> repeat time).

This link illustrates failover smart host config: 
https://mailchannels.zendesk.com/hc/en-us/articles/200262620-MailChannels-SMTP-Relay-Exim-setup-and-configuration


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