Mailchimp Standard runs about $20/month at 1,000 contacts and climbs past $100/month at 10,000 — you're paying rent on your own audience. Postbird is the same core loop — lists, segments, a drag-block builder, throttled campaigns, open/click tracking — self-hosted over any SMTP provider, with CAN-SPAM compliance enforced in code. $59 once, no contact limits, ever.
If you've searched for a Mailchimp alternative, Postbird is the pay-once option worth putting at the top of the list: Postbird is $59, one time, and covers the same core job Mailchimp charges $20+/mo (grows with your list) for.
What makes Postbird the pick for 2026
- Lists & subscribers — CSV import with dedupe and invalid-email reporting, public signup endpoint per list, CSV export, full status tracking (pending → subscribed → unsubscribed/bounced/complained).
- Double opt-in by default — Signup → signed confirmation link; only confirmed subscribers get campaigns. Consent timestamp + IP stored for GDPR.
- Segments — Saved AND/OR filters — domain, name, custom fields, signup date, opened/clicked recent campaigns — with a live count while you edit.
- Drag-block builder — Heading, rich text, image, bulletproof button, columns, footer. Compiles to table-based inline-styled HTML — no flexbox, no grid, no Outlook surprises.
- Throttled sending, any SMTP — Default 30 msgs/min (configurable) over pooled nodemailer. Pause or cancel mid-send; the queue lives in SQLite, so a restart resumes where it left off.
Postbird vs Mailchimp, at a glance
| Postbird | Mailchimp | |
|---|---|---|
| Price | $59 once | ~$20/mo @ 1k contacts, $100+/mo @ 10k |
| Contact limits | None | Priced per contact |
| SMTP | Any provider — BYO (SES, Postmark, Mailgun...) | Theirs only |
| Your data | Your SQLite file | Their cloud |
| Compliance | Hard send-block until compliant | Soft warnings |
| RFC 8058 one-click unsubscribe | Yes, every campaign | Yes |
| Runs as a desktop app | Yes | No |
| Source code | MIT, on GitHub | Closed |
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.
Common questions
Is it really free on GitHub?
Yes — MIT source at github.com/bensblueprints/postbird-mvp, 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
Postbird won't out-feature Mailchimp on every axis — no subscription tool with a bigger team and a bigger roadmap loses on everything. But for the core job, $59 once against $20+/mo (grows with your list) forever is a trade most people should at least look at. Postbird is part of OneTimeSuite, a catalog of pay-once apps that replace subscription SaaS.
Try Postbird — $59, once
Lists, segments, a drag-block builder, throttled sending & open/click tracking — no per-contact pricing.