Can I open-source Mailbutler?
KINDA · partial or early alternativesKinda. Stalwart and Listmonk cover the core of Mailbutler, but they're early or partial — expect gaps like team routing and shared inbox rules and abuse response and security operations.
Mailbutler: Email is infrastructure. Customers pay to avoid lost messages, broken auth, spam problems, and the reputational cost of a flaky inbox.
xteam routing and shared inbox rules
xabuse response and security operations
xcalendar-provider edge cases and timezone correctness
xprovider-grade deliverability
xpush reliability across devices
These projects already replace it, free.
LListmonkHigh-performance single-binary newsletter and mailing list manager with campaigns, templates, and Postgres backendopen source↗SStalwartModern all-in-one mail server in Rust with JMAP, IMAP, and SMTP plus built-in spam filtering.open source↗What each one is, in full: Listmonk · Stalwart
no votes, no pay-to-list · just what's real
Mailbutler pricing
| plan | monthly | annual (per mo) | what you get |
|---|---|---|---|
| starter | $0/user | $0/user | No published numeric email cap; 14-day all-feature trial falls back to Starter; every sent email carries a visible Mailbutler watermark. |
| professional | $9/user | $7/user | No published numeric send cap; includes templates, mail merge, assignments, notes/tasks/tags and automations; Smart Assistant excluded. |
| smart | $14/user | $11/user | No published numeric send or AI quota; adds per-recipient tracking plus Smart Compose, Improve, Timing, Follow-ups, Task Finder and Summarize. |
| business | custom | — | Custom plan; no numeric caps published; adds a custom subdomain, CRM tracking sync and advanced signature controls. |
free tierNo published numeric email cap; $0 forever, but every sent email includes a visible Mailbutler watermark; 14-day full-feature trial
billingmonthly + annual (up to 25% off); USD/EUR; 14-day trial, no card
hidden costsMail Merge is constrained by the connected email provider's sending limits; Smart Assistant requires Smart or Business after trial; Business has no public price and custom SMTP is still marked coming soon.
verified 2026-08-12 · source ↗
Can I open-source Mailbutler?
Kinda. Listmonk covers the core of Mailbutler, but there are real gaps: team routing and shared inbox rules, abuse response and security operations. Read the honest list above before committing.
How much does Mailbutler cost?
Mailbutler's pricing is usage-based or varies by plan · The official pricing URL is recorded, but a stable current amount was not safely recoverable in this pass. Do not publish a number until rechecked..
What do I lose by replacing Mailbutler?
Honestly: team routing and shared inbox rules; abuse response and security operations; calendar-provider edge cases and timezone correctness; provider-grade deliverability; push reliability across devices. If any of those are load-bearing for you, keep paying.
Is there an open-source alternative to Mailbutler?
Yes: Listmonk (High-performance single-binary newsletter and mailing list manager with campaigns, templates, and Postgres backend) Stalwart (Modern all-in-one mail server in Rust with JMAP, IMAP, and SMTP plus built-in spam filtering.)