# 6 Best Open Source Alternatives for MailerSend

Canonical: https://caniforkit.com/mailersend
Last updated: 2026-11-07

Looking for the best open source alternative for MailerSend? Compare 6 verified free and open source alternatives to MailerSend (Postal, Plunk, useSend) with license details, self-hosting requirements, and practical trade-offs.

## MailerSend Overview & Subscription Cost
- **Product**: MailerSend
- **Category**: [email](https://caniforkit.com/category/email)
- **Paid Subscription Price**: $15/month per seat
- **1-Seat Annualized Cost**: $180/year
- **5-Person Team Annualized Cost**: $900/year
- **10-Person Team Annualized Cost**: $1,800/year
- **Can I Vibe-Code / Rebuild It Myself?**: NO (use a free alternative, save the tokens)
- **Rebuild Verdict**: Instead of paying recurring SaaS fees for MailerSend or rebuilding it from scratch, deploy one of the 6 battle-tested open-source alternatives like Postal.

## Verified Free & Open Source Alternatives

| Alternative | Type | License | Runs On | GitHub Stars | Head-to-Head |
| --- | --- | --- | --- | --- | --- |
| [Postal](https://caniforkit.com/fork/postal) | Open Source | Open Source | Self-host | ★ 16.9k | [Compare vs MailerSend](https://caniforkit.com/vs/mailersend-vs-postal) |
| [Plunk](https://caniforkit.com/fork/plunk) | Open Source | AGPL-3.0 | Self-host | ★ 5.6k | [Compare vs MailerSend](https://caniforkit.com/vs/mailersend-vs-plunk) |
| [useSend](https://caniforkit.com/fork/usesend) | Open Source | Open Source | Self-host | ★ 4.8k | [Compare vs MailerSend](https://caniforkit.com/vs/mailersend-vs-usesend) |
| [Sessy](https://caniforkit.com/fork/sessy) | Open Source | Open Source | Self-host | ★ 945 | [Compare vs MailerSend](https://caniforkit.com/vs/mailersend-vs-sessy) |
| [Hyvor Relay](https://caniforkit.com/fork/hyvor-relay) | Open Source | Open Source | Self-host | ★ 922 | [Compare vs MailerSend](https://caniforkit.com/vs/mailersend-vs-hyvor-relay) |
| [Wraps](https://caniforkit.com/fork/wraps) | Open Source | Open Source | Local | ★ 66 | [Compare vs MailerSend](https://caniforkit.com/vs/mailersend-vs-wraps) |

## In-Depth Alternative Profiles

### Postal
- **Fork Page**: [Postal Profile](https://caniforkit.com/fork/postal)
- **Head-to-Head Comparison**: [MailerSend vs Postal](https://caniforkit.com/vs/mailersend-vs-postal)
- **Official Website**: https://docs.postalserver.io/
- **Source Code Repository**: https://github.com/postalserver/postal
- **License**: Open Source
- **Runs On**: Self-host
- **GitHub Stars**: 16.9k
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: web, self-hosted, docker to self-host
- **Summary**: Run your own mail delivery infrastructure with a web interface, webhooks, IP pools, and spam filtering integrations for inbound and outbound email.
- **The Catch vs MailerSend**: Requires self-hosting setup, updates, and server maintenance compared to managed MailerSend.
- **Installation**: Clone https://github.com/postalserver/postal or deploy with Docker Compose
- **Setup**: Deploy via Docker or binary release from GitHub and configure environment variables.
- **Data Storage**: All application data and configuration live on your own server or local database.

### Plunk
- **Fork Page**: [Plunk Profile](https://caniforkit.com/fork/plunk)
- **Head-to-Head Comparison**: [MailerSend vs Plunk](https://caniforkit.com/vs/mailersend-vs-plunk)
- **Official Website**: https://useplunk.com
- **Source Code Repository**: https://github.com/useplunk/plunk
- **License**: AGPL-3.0
- **Runs On**: Self-host
- **GitHub Stars**: 5.6k
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: web, self-hosted, docker to self-host
- **Summary**: Plunk unifies marketing, transactional, and broadcast emails into a single, complete solution for businesses of all sizes.
- **The Catch vs MailerSend**: Plunk is developer-first and much thinner in visual audience management, CRM depth, segmentation tooling, and marketer-oriented reporting.
- **Installation**: Hosted signup, or the official Docker Compose stack
- **Setup**: Hosted use still needs domain authentication; self-hosting adds PostgreSQL, Redis, MinIO, Nginx or another proxy, exposed web and SMTP services, DNS, and ongoing deliverability work.
- **Data Storage**: The self-hosted stack stores core data in PostgreSQL, jobs and cache in Redis, and objects in MinIO; hosted data is kept in Plunk's EU infrastructure.

### useSend
- **Fork Page**: [useSend Profile](https://caniforkit.com/fork/usesend)
- **Head-to-Head Comparison**: [MailerSend vs useSend](https://caniforkit.com/vs/mailersend-vs-usesend)
- **Official Website**: https://usesend.com
- **Source Code Repository**: https://github.com/usesend/usesend
- **License**: Open Source
- **Runs On**: Self-host
- **GitHub Stars**: 4.8k
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: web, self-hosted, docker to self-host
- **Summary**: Open source email platform for transactional and marketing emails. Self-host or use cloud service with transparent pricing - pay only for emails sent.
- **The Catch vs MailerSend**: Requires self-hosting setup, updates, and server maintenance compared to managed MailerSend.
- **Installation**: Clone https://github.com/usesend/usesend or deploy with Docker Compose
- **Setup**: Deploy via Docker or binary release from GitHub and configure environment variables.
- **Data Storage**: All application data and configuration live on your own server or local database.

### Sessy
- **Fork Page**: [Sessy Profile](https://caniforkit.com/fork/sessy)
- **Head-to-Head Comparison**: [MailerSend vs Sessy](https://caniforkit.com/vs/mailersend-vs-sessy)
- **Official Website**: https://sessy.do/
- **Source Code Repository**: https://github.com/marckohlbrugge/sessy
- **License**: Open Source
- **Runs On**: Self-host
- **GitHub Stars**: 945
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: web, self-hosted, docker to self-host
- **Summary**: Track SES deliveries, bounces, opens and clicks in a self-hosted dashboard with real-time search, analytics and reputation monitoring.
- **The Catch vs MailerSend**: Requires self-hosting setup, updates, and server maintenance compared to managed MailerSend.
- **Installation**: Clone https://github.com/marckohlbrugge/sessy or deploy with Docker Compose
- **Setup**: Deploy via Docker or binary release from GitHub and configure environment variables.
- **Data Storage**: All application data and configuration live on your own server or local database.

### Hyvor Relay
- **Fork Page**: [Hyvor Relay Profile](https://caniforkit.com/fork/hyvor-relay)
- **Head-to-Head Comparison**: [MailerSend vs Hyvor Relay](https://caniforkit.com/vs/mailersend-vs-hyvor-relay)
- **Official Website**: https://relay.hyvor.com
- **Source Code Repository**: https://github.com/hyvor/relay
- **License**: Open Source
- **Runs On**: Self-host
- **GitHub Stars**: 922
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: web, self-hosted, docker to self-host
- **Summary**: Self-hosted email API alternative to AWS SES & Mailgun. Open-source AGPL-3.0 with enterprise features, automated deliverability, and cloud version coming 2026.
- **The Catch vs MailerSend**: Requires self-hosting setup, updates, and server maintenance compared to managed MailerSend.
- **Installation**: Clone https://github.com/hyvor/relay or deploy with Docker Compose
- **Setup**: Deploy via Docker or binary release from GitHub and configure environment variables.
- **Data Storage**: All application data and configuration live on your own server or local database.

### Wraps
- **Fork Page**: [Wraps Profile](https://caniforkit.com/fork/wraps)
- **Head-to-Head Comparison**: [MailerSend vs Wraps](https://caniforkit.com/vs/mailersend-vs-wraps)
- **Official Website**: https://wraps.dev/
- **Source Code Repository**: https://github.com/wraps-team/wraps
- **License**: Open Source
- **Runs On**: Local
- **GitHub Stars**: 66
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: desktop, cross-platform, one-click install
- **Summary**: Build email templates as React components and automations in TypeScript. Deploy to your AWS account with SES integration. Marketing teams edit content without code.
- **The Catch vs MailerSend**: Community-driven open source project without dedicated enterprise SLAs.
- **Installation**: Clone https://github.com/wraps-team/wraps or deploy with Docker Compose
- **Setup**: Download the native package or installer for your operating system.
- **Data Storage**: All application data lives locally on your own machine.

## Frequently Asked Questions

### What is the best free alternative to MailerSend?
The top free alternative to MailerSend is Postal (open source, Open Source). Run your own mail delivery infrastructure with a web interface, webhooks, IP pools, and spam filtering integrations for inbound and outbound email. Other popular MailerSend replacements include Plunk, useSend, Sessy.

### How much does switching from MailerSend to a free alternative save?
MailerSend starts at $15/month per seat ($180/year). Switching a 5-person team to a free alternative like Postal saves $900 per year in software subscription fees.

### What is the catch when switching away from MailerSend?
While Postal replaces core MailerSend features without subscription fees, the real-world trade-off is: Requires self-hosting setup, updates, and server maintenance compared to managed MailerSend.

## Related

- [email Software Category Hub](https://caniforkit.com/category/email)
- [All Paid SaaS Alternatives Index](https://caniforkit.com/alternatives)
- [Self-Hosted Software Directory](https://caniforkit.com/self-hosted)
- [Homepage](https://caniforkit.com)