MailerSend costs $15/mo.
These cost $0.
6 free alternatives to MailerSend, checked for license, recent activity and real adoption. Each one tells you the catch, so you can switch with your eyes open.
The top-rated free, open-source replacement for MailerSend is Postal (Open Source Open Source). Across this category, 5 self-hostable tools are available (including Postal and Plunk). Switching a 5-person team saves up to $900/year compared to MailerSend's $15/mo subscription.
The catch: Requires self-hosting setup, updates, and server maintenance compared to managed MailerSend.
MailerSend vs Free Alternatives
Quick side-by-side comparison · $0/mo vs $15/mo
| Alternative | Type | License | Where It Runs | Stars | Head-to-Head |
|---|---|---|---|---|---|
| Postal | open source | Open Source | Self-host | ★ 16.9k | MailerSend vs Postal → |
| Plunk | open source | AGPL-3.0 | Self-host | ★ 5.6k | MailerSend vs Plunk → |
| useSend | open source | Open Source | Self-host | ★ 4.8k | MailerSend vs useSend → |
| Sessy | open source | Open Source | Self-host | ★ 945 | MailerSend vs Sessy → |
| Hyvor Relay | open source | Open Source | Self-host | ★ 922 | MailerSend vs Hyvor Relay → |
| Wraps | open source | Open Source | Local | ★ 66 | MailerSend vs Wraps → |
The picks
6 open source · ranked by fit
- 01
Postal
open sourceOpen SourceSelf-host16.9knov 2026Run your own mail delivery infrastructure with a web interface, webhooks, IP pools, and spam filtering integrations for inbound and outbound email.
The catch vs MailerSendRequires self-hosting setup, updates, and server maintenance compared to managed MailerSend.
Install, platforms & data +
- platforms
- webself-hosteddocker to self-host
- install
- Clone https://github.com/postalserver/postal or deploy with Docker Compose
- setup
- Deploy via Docker or binary release from GitHub and configure environment variables.
- your data
- All application data and configuration live on your own server or local database.
- checked
- 2026-11-07
- 02
Plunk
open sourceAGPL-3.0Self-host5.6knov 2026Plunk unifies marketing, transactional, and broadcast emails into a single, complete solution for businesses of all sizes.
The catch vs MailerSendPlunk is developer-first and much thinner in visual audience management, CRM depth, segmentation tooling, and marketer-oriented reporting.
Install, platforms & data +
- platforms
- webself-hosteddocker to self-host
- install
- 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.
- your data
- 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.
- checked
- 2026-11-07
- 03
useSend
open sourceOpen SourceSelf-host4.8knov 2026Open 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 MailerSendRequires self-hosting setup, updates, and server maintenance compared to managed MailerSend.
Install, platforms & data +
- platforms
- webself-hosteddocker to self-host
- install
- Clone https://github.com/usesend/usesend or deploy with Docker Compose
- setup
- Deploy via Docker or binary release from GitHub and configure environment variables.
- your data
- All application data and configuration live on your own server or local database.
- checked
- 2026-11-07
- 04
Sessy
open sourceOpen SourceSelf-host945nov 2026Track SES deliveries, bounces, opens and clicks in a self-hosted dashboard with real-time search, analytics and reputation monitoring.
The catch vs MailerSendRequires self-hosting setup, updates, and server maintenance compared to managed MailerSend.
Install, platforms & data +
- platforms
- webself-hosteddocker to self-host
- install
- Clone https://github.com/marckohlbrugge/sessy or deploy with Docker Compose
- setup
- Deploy via Docker or binary release from GitHub and configure environment variables.
- your data
- All application data and configuration live on your own server or local database.
- checked
- 2026-11-07
- 05
Hyvor Relay
open sourceOpen SourceSelf-host922nov 2026Self-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 MailerSendRequires self-hosting setup, updates, and server maintenance compared to managed MailerSend.
Install, platforms & data +
- platforms
- webself-hosteddocker to self-host
- install
- Clone https://github.com/hyvor/relay or deploy with Docker Compose
- setup
- Deploy via Docker or binary release from GitHub and configure environment variables.
- your data
- All application data and configuration live on your own server or local database.
- checked
- 2026-11-07
- 06
Wraps
open sourceOpen SourceLocal66nov 2026Build 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 MailerSendCommunity-driven open source project without dedicated enterprise SLAs.
Install, platforms & data +
- platforms
- desktopcross-platformone-click install
- install
- Clone https://github.com/wraps-team/wraps or deploy with Docker Compose
- setup
- Download the native package or installer for your operating system.
- your data
- All application data lives locally on your own machine.
- checked
- 2026-11-07
MailerSend Head-to-Head Comparisons (2027)
Side-by-side trade-off breakdowns · 6 free alternatives
Frequently Asked Questions
Direct answers · MailerSend open-source replacements
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.
Can I self-host a free replacement for MailerSend?+
Yes. Of the 6 free alternatives to MailerSend, 5 can be self-hosted on your own server or local machine: Postal (Open Source), Plunk (AGPL-3.0), useSend (Open Source), Sessy (Open Source), Hyvor Relay (Open Source).
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.
Should I vibe-code or build my own MailerSend clone from scratch?+
Our build verdict for MailerSend is NO (use a free alternative, save the tokens). 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.
What is the catch when switching from MailerSend to Postal?+
Requires self-hosting setup, updates, and server maintenance compared to managed MailerSend.
