Sendy is the original self-hosted answer to Mailchimp's per-contact rent, and credit where due: it proved the model. Pay $69 once, run a PHP app on your server, send through Amazon SES at $1 per 10,000 emails, and watch the Mailchimp bill disappear. Thousands of newsletters have run on it for a decade, and for many it has been superb value.
So this is not a subscription-versus-ownership post — Sendy already won that argument. It is about the constraints Sendy carries in 2026: it is hard-locked to Amazon SES, closed source with a license key, and built on a PHP/MySQL stack you must provision. Postbird is the modern take on the same idea: $59 once, any SMTP provider, MIT source, one Node process with SQLite — and it runs as a desktop app.
What Sendy does well
Sendy earned its reputation honestly:
- A decade of production credibility — it is boring in the best way, with a huge base of long-term users.
- Rock-bottom sending costs — SES at roughly $0.10 per thousand emails, orders of magnitude below ESP pricing.
- A real one-time price — $69 with the ownership model Postbird shares; no meter, no contact-based rent.
- A plugin/integration ecosystem — years of community connectors for WordPress and friends.
If you are already happily running Sendy on SES, the savings are real and there is no urgent reason to move.
Where the subscription model hurts
The SES lock-in is the big one. Sendy does not send through anything else — no Postmark, no Mailgun, no your-own-Postfix. That means an AWS account, SES sandbox exit and SES's reputation policies are prerequisites, and if SES suspends you (it happens, and its appeals process is famously opaque), your newsletter is simply down. Being one closed-source vendor's bridge to one cloud provider's API is two lock-ins stacked.
The stack shows its age too: PHP plus MySQL to provision, cron jobs to configure by hand, and a codebase you cannot read — it is closed source, license-keyed and obfuscated, so security review means trusting the vendor. Compliance is likewise on you: modern requirements like RFC 8058 one-click unsubscribe headers (which Gmail and Yahoo now demand from bulk senders) are your responsibility to verify rather than guarantees enforced by the software.
Postbird: the pay-once alternative
Postbird is a $59, one-time purchase. Self-hosted email campaigns over your own SMTP. Stop renting your audience back. Postbird is what the Sendy idea looks like rebuilt in 2026: a drag-block builder compiling to table-based email-safe HTML, segments with live counts, throttled queue sending that resumes after restarts, double opt-in with consent records, HMAC-signed open/click tracking, and bounce webhooks accepting SES-SNS, Postmark, Mailgun or generic payloads. Compliance is enforced in code — physical-address send-block, auto-appended unsubscribe footer, RFC 8058 headers on the wire, all asserted by the test suite. $59 once, any SMTP, MIT source.
The source code is MIT-licensed at github.com/bensblueprints/postbird — free to build and run yourself, forever. Buying the packaged version on Whop gets you the signed installer, 1-click setup and updates. Either way, there is no account, no telemetry and no renewal date.
Head to head
| Postbird | Sendy | |
|---|---|---|
| Price | $59 once | $69 one-time + SES usage |
| Cost over 3 years | $59 | $69 + ~$0.10/1k emails |
| Where your data lives | Your machine / your server | Your server (sending via SES) |
| Usage limits | None — unlimited use | Amazon SES only; PHP/MySQL stack |
| Works offline | Yes | Self-host: yes |
| Source code | MIT, on GitHub | Closed (license key) |
Who should stay with Sendy
Stay with Sendy if you are on SES already, your setup works, and its ecosystem of integrations matters to you — a working newsletter pipeline is not something to churn for sport. The $69 you spent is spent well.
Switch if you are choosing today: Postbird is $10 cheaper, SMTP-agnostic (SES when you want cheap, Postmark when you want deliverability — swap anytime), MIT-licensed so you can audit every line, and one Node process with SQLite instead of a LAMP stack. The desktop mode for authoring is something Sendy simply does not have.
Making the switch
Step 1 — Buy once on Whop. One-time $59 for the packaged version — no per-contact pricing, no subscription to escalate as your list grows.
Step 2 — Plug in your SMTP. Amazon SES ($0.10 per 1,000 emails), Postmark or Mailgun credentials. You inherit their deliverability reputation; Postbird handles the queue and throttle.
Step 3 — Import, build, send. CSV-import your list, drag blocks into an email, and send throttled campaigns with live progress and open/click reports.
Common questions
Is it really free on GitHub?
Yes — MIT source at github.com/bensblueprints/postbird, always. $59 buys the packaged installer, 1-click setup and updates — and funds the open-source version.
Will my emails land in the inbox?
Deliverability is your SMTP provider's job, and Postbird is honest about that: use SES or Postmark credentials and you inherit their IP reputation. Mailchimp's managed sending infrastructure is genuinely convenient if you'd rather not think about SPF/DKIM at all — that's what the monthly fee buys.
Is it actually CAN-SPAM / GDPR compliant?
The legal minimums are enforced in code, not suggested: the server returns a 400 if you try to send without a physical address configured, the compiler appends an unsubscribe footer if a template lacks one, and every email carries RFC 8058 one-click unsubscribe headers — which Gmail and Yahoo require for bulk senders.
The bottom line
Subscriptions make sense when a service does ongoing work for you — hosting, syncing, multi-region infrastructure, human labor. They make much less sense when the work happens on your own hardware and the monthly bill is just a toll booth. Postbird is our bet that for this job, most people are better served owning the tool: $59 once, at 1,000 contacts, Mailchimp Standard costs more than Postbird every three months, forever. Break-even is ~2 months — and the bigger your list gets, the more you save.
Postbird is part of OneTimeSuite — 56 desktop and self-hosted apps built on the same principle: your hardware does the work, so you should not pay rent on it. Every app is a one-time purchase with MIT-licensed source on GitHub, no accounts and no telemetry. Want everything at once? OneTimeSuite Complete bundles the whole suite for a single flat $997.
Try Postbird — $59, one time
Signed installer on Whop, or build it free from the MIT source. Your call.
Related comparisons: Mailchimp alternative — or browse the whole pay-once suite.