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POP3 clients may be required to send USER/PASS, but the proxy never uses them. Accept any client credentials blindly and always authenticate to the IMAP backend with the configured BACKEND_IMAP_USER / BACKEND_IMAP_PASS. Remove the previous fallback that connected to the backend using client-supplied credentials when backend credentials were unset; the proxy now raises a clear configuration error in that case. Add tests covering that client credentials are ignored and that missing backend credentials are reported. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>