Is there a way to supply more than one host in "relay via" similar to having multiple priority based MX records? I am trying to replicate the follow hosts for google apps domains ( https://support.google.com/a/answer/174125?hl=en). Currently I just use the first one, but if there is ever a problem with that host/route, it'd be nice to reroute to a backup host rather than delay the email until it's back up.
Thanks! -Michael
