Ghost
98 · HealthyPublishing platform for blogs and newsletters, with paid memberships, subscriptions and email delivery built in.
Open source Email marketing
Mautic
87 · HealthyMarketing automation platform with campaigns, segments, landing pages and lead scoring.
listmonk
83 · HealthyHigh-performance newsletter and mailing-list manager shipped as a single binary.
useSend
74 · StableEmail sending service with an API, SMTP, domain management and campaigns, running on Amazon SES.
Posta
71 · StableEmail delivery service that lets your apps send through an HTTP API, with templates, delivery tracking and analytics.
Plunk
70 · StableEmail platform for SaaS products that combines transactional email, campaigns and automations on top of Amazon SES.
Postal
65 · StableMail delivery platform for sending transactional email from your own servers.
Keila
64 · StableNewsletter tool with a block editor, sign-up forms and campaign stats.
Dittofeed
61 · StableCustomer engagement platform for automated email, SMS and push journeys.
BillionMail
56 · CautionSelf-hosted mail server and newsletter platform for campaigns, templates and subscriber lists.
Mailtrain
15 · At riskSelf-hosted newsletter app built on Node.js.
Source-available and unverified licenses
The code for these is public, but the license is not an OSI open source license, or we have not verified it yet. Check the license notes on each project before relying on it.
Notifuse
68 · StableNewsletter, email marketing and transactional email platform with a visual MJML editor and several sending providers.
Posta
Email delivery service that lets your apps send through an HTTP API, with templates, delivery tracking and analytics.
Will it still be around?
Stable
Score 71/100
Can a business use it freely?
Free, share hosted changes
AGPL-3.0 · open source (copyleft) · relicensed stricter in 2026
Flat Rate Deploy
At 50,000 emails a month, SendGrid (about $20 a month) is the cheaper choice. Switching to Posta on OpenSoft saves money from 300,000 emails a month.
Monthly cost
- Posta on OpenSoft
- $39
- SendGrid
$20
You save each month
−$19/mo
-95% less than today
Saving from month one
You save
- Over 3 years
- −$686
- In year one
- −$229
List price checked 8 Oct 2026 · Source · Disclaimer
Health score: 71/100
Stable · activity, bus factor and issue responsiveness, from GitHub
Score v2 · How it works
Activity
45% weight100/100
- Last commit 5 days ago (100/100).
- 513 commits in the past 12 months (100/100).
- 41 releases in the past 12 months (100/100).
Bus factor
30% weight3/100
- Top contributor wrote 98% of the last 83 commits (past 12 months).
- 3 people authored those commits.
Responsiveness
25% weight100/100
- 100% of all issues are closed (0 open, 11 closed) (100/100).
- 11 of 11 recent issues got a reply or were closed (100/100).
License
Free, share hosted changes
AGPL-3.0 · Open source (copyleft)Relicensed 2026
What you need to do
Free for any use, commercial included. If you change the code and people outside your company use it over the network, you must publish your changes under the same license.
GNU Affero General Public License v3.0 · Open source (copyleft). OSI-approved license that requires sharing changes under the same license when you distribute (AGPL: also when you offer it over a network).
Detected by GitHub as AGPL-3.0.
License history
- Apache-2.0 → AGPL-3.0 · Moved from Apache-2.0 to AGPL-3.0. · commit
GitHub activity
- Stars
- 521
- Forks
- 55
- Commits, 12 mo
- 513
- last 5 days ago
- Releases, 12 mo
- 41
- last 13 days ago
- Contributors
- 7
- 3 in last 83 commits
- Open issues
- 0
- 11 closed
Snapshot from 2026-10-08
Top contributors
How points workPoints for pull requests merged into Posta and reviews of them since 9 October 2025. Building something another user asked for earns more.
