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I have many machines, each of which have one or many applications that send messages. And I have one machine with an instance of Rabbit to which all messages are sent. If the network is down or the Rabbit machine is down, the messages are gone along with their data.

Clustering the Rabbit machine helps one particular failure scenario, but it's not a solution to the problem.

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I haven't worked with RabbitMQ in years, but IIRC I solved this with federation. My sends were all to localhost or a VM on the same machine.

That solves the problem of lost messages if you have e.g. a network problem between servers. I don't know what to do about RabbitMQ being down, all you can really do about that is move the exact same problem somewhere else by making things much more complicated, such that it's probably not worth it. If the place you're storing outbound messages is broken, you (obviously) can't store them, whether that's PostgreSQL, Redis, a remote RabbitMQ server, a local RabbitMQ, whatever.

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