unassignable verifiedimportant

This happens when the address a message demands cannot reach the destination it names: an IPv4 message to an IPv6-only receiver, a pool with no members, a rewrite rule that removed every address. The message is not delivered and not retried into existence. It is one of the two counters missing from failures, which makes it doubly worth watching: a node can have a growing configuration problem while its failure chart stays flat. For warm-up, where addresses are added and removed constantly, this is the counter that catches a plan that points at an address the node does not have.