Postmark
The value is the network, the data or the infrastructure. Keep paying.
Sends the email your application produces — receipts, password resets, notifications — over an API or SMTP. It keeps separate sending infrastructure for transactional mail, stores the full message history, and reports on bounces and opens.
Do not run your own mail server. Build the layer above a sending provider. STACK - Node with Fastify, SQLite via better-sqlite3, an SMTP relay - You are outsourcing reputation on purpose, because reputation is the part you cannot write TEMPLATES - Files on disk: a Markdown body with front matter for the subject - Rendered to table-based HTML with a plain-text alternative always - Previewed in the browser at /preview/:template SENDING - An endpoint taking template, recipient and variables, which enqueues rather than sending inline - A slow provider must never block a web request - An idempotency key, so a retried API call cannot send a second receipt THE WORKER - Exponential-backoff retries, a dead-letter state and a visible failed queue THE LOG - Every message appended with template, recipient, provider message id, status and UTC timestamp - Provider webhooks add rows; they never edit the ones already there SUPPRESSION - Fed by bounces and complaints, consulted before every send, with no bypass Include a README on SPF, DKIM and DMARC, and on warming a new sending domain.
What you lose
- Sending IP reputation built over years, which is the entire reason a password reset arrives
- Separation of transactional from marketing streams, so a campaign cannot poison your receipts
- Bounce, complaint and spam-trap handling wired into feedback loops with the mailbox providers
- Delivery timing measured in seconds, and a status page you can point at when it is not
- Message history and a searchable log of what was actually sent to whom
If you would rather not build
- Amazon SES — the cheap provider you build this layer on top of
- Resend and Loops — friendlier APIs, same underlying trade
The escape hatch
open source · no votes, no paid placement
Postal
$0Full mail server for application email, with queues and bounce handling.
postalserver/postalfree · open source
Keila
$0Newsletter tool built on Elixir that sends through your own provider.
pentacent/keilafree · open source
Why this verdict
our own opinion · changed only by a person
24/100
Verdict no at 24: SMTP is trivial and deliverability is not. A self-run mail server for transactional email means password resets landing in spam, which is worse than any subscription. Rent the reputation, build the queue and the log.
History
tracked since 6 Aug 2026 · nothing is ever overwritten
Nothing recorded yet. This chart fills in once the page has visitors, votes or prompt copies — it will not draw a flat line to look busy.
Questions about Postmark
answered from the record above
Is Postmark free?
No — the plan we track is $15 a month. Basic at the 10,000 emails per month tier. Pro is $16.50 and Platform $18 at the same volume; additional emails are billed per thousand.
Can you replace Postmark by building your own?
KEEP IT. The value is the network, the data or the infrastructure. Keep paying. Replacement score 24 out of 100, build time longer than it saves. Read what you lose before you decide.
How much does Postmark cost?
$15 a month on Basic — $180 a year. Recorded 6 Aug 2026.
What do you lose by replacing Postmark?
Sending IP reputation built over years, which is the entire reason a password reset arrives; Separation of transactional from marketing streams, so a campaign cannot poison your receipts; Bounce, complaint and spam-trap handling wired into feedback loops with the mailbox providers; Delivery timing measured in seconds, and a status page you can point at when it is not; Message history and a searchable log of what was actually sent to whom. If any of those carry weight for you, keep paying.
Is there an open-source alternative to Postmark?
Yes: Postal, Keila. The prompt on this page is for when you want it your way instead.
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