MTA Administration

The configuration layer most ESPs hide from their users. PowerMTA tuning (vMTAs, per-ISP queueing, accounting log analysis), Postfix in production (main.cf, master.cf, transport_maps for per-ISP routing), KumoMTA — the modern Rust-based open-source competitor built by PowerMTA's original creator — and the trade-offs between commercial MTAs (Halon, MailerQ) and open-source alternatives. This category is for operators running their own infrastructure, not consumers of managed services.