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Scored across 10 tools
Most tools target distinct facets: queue_summary (counts), queue_shape (age matrix), queue_list (individual messages), log_stats (aggregate outcomes), log_trace (single-message), log_trend (per-destination trend), and mail_dns_check. The main overlap is that postfix_doctor is a one-call aggregate that duplicates much of queue_summary/log_stats/DNS, and log_stats vs log_trend share a time-window log surface, but descriptions make the boundaries workable.
Nine tools follow a consistent snake_case postfix_<subject>_<aspect> pattern (queue_list, log_trace, log_stats, reason_categories, etc.). Only mail_dns_check breaks the prefix, though it retains the same snake_case verb_noun style, making it a minor deviation rather than an inconsistency.
Ten tools is a well-scoped count for a Postfix diagnostics server, with each tool covering a distinct grain of analysis (DNS, config, queue, logs, categories, plus a doctor aggregate). No tool feels redundant padding.
The surface covers the key diagnostic lifecycle well: DNS/auth checks, config inspection, queue views at three grains, log aggregation/trace/trend, and failure categorization. The notable gap is that everything is read-only — no remediation actions such as queue flush, requeue, or delete — which an operator would likely want next.