430,000 KRW informational until enrollment confirms
Program narrative
Synthetic mail storms teach you to read qshape output, throttle sensibly, and write honest stakeholder updates. We also cover when to stop tuning Postfix and call the application team.
What the labs include
Queue inspection shortcuts
Deferred reason taxonomy
Greylisting vs reputation exercises
Safe flush vs risky flush roleplay
Header redaction for ticket attachments
Rate limit tuning with before/after charts
Handoff template for app owners
Outcomes you can show a lead
Pick the next command after postqueue -p
Draft an outage note without overpromising ETA
Throttle bulk sends without killing legit traffic
Straight FAQ
Microsoft Exchange overlap?
We stay on Postfix labs; Exchange is mentioned only as a handoff boundary.
Spam tooling?
RSPAMD referenced; not installed in shared labs.
Limitations?
DKIM key rotation for external DNS vendors is demo-only.
Recent participant notes
“Greylisting lab felt cruel then clarifying. I would like a follow-up on milter debugging someday.”
Dae
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