Treat partitions as unreachable hosts #193
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Instead of returning
ErrorKind::ConnectionRefused
for all deliver failures, this commit makes the following differentiations:ErrorKind::HostUnreachable("host unreachable")
ErrorKind::HostUnreachable("host unreachable")
Rust 1.83 has dropped and with it comes new error kinds. We can classify host unreachable errors with their proper error type now.
This PR also fixes some clippy warnings from 1.83.
Fixes #169