Web Reference: The hints and tips in this document help you improve the performance of Postfix systems that already work. If your Postfix system is unable to receive or deliver mail, then you need to solve those problems first, using the DEBUG_README document as guidance. May 17, 2020 · Postfix is a free and open-source Mail Transfer Agent (MTA) which is rich in features and if configured properly can be used for sending mails faster than other MTAs. Postfix by itself should be able to handle at least an order of magnitude greater than that on entry-level server hardware. So I suspect you have more than just postfix running, or very unevenly distributed throughput peaks. Your situation certainly looks like a heavily I/O-bound server.
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