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Kingmailer
Transactional SMTP Service — Kingmailer is a simple and fully featured mail server / SMTP service build for sending transactional emails
verified Jul 13, 2026 · HTTP 200
CohortClass of 2017What it is
Transactional SMTP Service — Kingmailer is a simple and fully featured mail server / SMTP service build for sending transactional emails. Think Sendgrid and Mailgun but our focus is solely on delivery of transactional emails. Start sending, receiving or routing emails with a few clicks. [Web App, Email, Productivity]
HTTP liveness
11 probes since Jun 16Jun 16Jul 13
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jun 16, 2026First probe — liveAlive · 200 OK
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Pulse Indexobserved activity
11 probes0 pressGitHub –Tranco –
Not enough observed signals for a Pulse Index (needs 2+ signal families).
Cohort survival · Class of 2017weekly
13,497 products launched in 2017 · 100% still active
13,462 active35 sunset
Still active
100%
Median lifespan
4.9y