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redundant routes in db/routes?

Is it possible to have multiple routes specified in the
db/routes for a particular subdomain?  For example, if the
routes file currently reads:
	subdom.example.com	smtp!host-a.example.com
is it possible to have something like
	subdom.example.com	smtp!host-a.example.com
	subdom.example.com	smtp!host-b.example.com

The desire is to have a redundant route to host-a for when
this machine cannot reach host-a but can reach host-b (and host-b
knows how to forward mail to host-a).  Yes, I know that this is the
canonical example of when to use DNS MX records to obtain redundancy,
however there are other reasons for not wanting host-a to appear as
an MX in any zone files.

If this *is* permitted, what is the permitted syntax, how are the
routes weighed, and what kind of behavior can be expected if there
is a loop via the routes file?  (Presumably the answer to the last
one is that the mail would loop until the maximum loop count is
         Devin Reade         <gdr@gno.org>

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