useSend
Best for self-hosting
Why teams pick it
Developers who want to run email infrastructure on their own servers
Open-source alternatives to Resend
Compare community-driven replacements for Resend in mail servers & relays workflows. We curate active, self-hostable options with transparent licensing so you can evaluate the right fit quickly.
Resend
Resend provides REST APIs and SDKs to send transactional and campaign emails programmatically. It supports custom domains, template workflows (including React Email), webhooks, suppression management, and analytics, with tight integration into modern JavaScript frameworks and CI/CD pipelines.Read more
Key stats
- 4Alternatives
- 2Support self-hosting
Run on infrastructure you control
- 3Active development
Recent commits in the last 6 months
- 2Permissive licenses
MIT, Apache, and similar licenses
Counts reflect projects currently indexed as alternatives to Resend.
Start with these picks
These projects match the most common migration paths for teams replacing Resend.
Plunk
Privacy-first alternative
Why teams pick it
Self-hosted email platform powered by AWS SES
All open-source alternatives
useSend
Self‑hosted email platform delivering reliable, low‑cost SES mail
Self-host friendlyActive developmentPrivacy-firstTypeScript
Why teams choose it
- Dashboard with delivery, open, click, and bounce metrics
- REST and scheduled API for transactional and marketing emails
- SMTP endpoint compatible with existing tools
Watch for
Beta stage may lack stability
Migration highlight
Transactional order confirmations
Deliver reliable order emails with real‑time open tracking
Plunk
Self-hosted email platform powered by AWS SES
Self-host friendlyActive developmentPrivacy-firstTypeScript
Why teams choose it
- Transactional email API integrated with AWS SES
- Automation workflows triggered by user actions
- Broadcast capability for newsletters and product updates
Watch for
Tied to AWS SES pricing and limits
Migration highlight
Order confirmation emails
Send reliable transactional messages instantly after purchase, ensuring customers receive receipts.
Go-Guerrilla
Lightweight SMTP server for high-volume email reception in Go
Permissive licenseIntegration-friendlyAI-powered workflowsGo
Why teams choose it
- Multi-server architecture with shared backend for horizontal scaling
- Hot-reloadable configuration without service interruption
- Chainable processor system for MySQL, Redis, MailDir, and custom backends
Watch for
Project was abandoned by original maintainer, now community-maintained
Migration highlight
Disposable Email Service
Receive millions of temporary emails daily, parse headers, store bodies in Redis, and log metadata to MySQL for fast retrieval
Haraka
High-performance Node.js SMTP server with modular plugin architecture
Active developmentPermissive licenseIntegration-friendlyJavaScript
Why teams choose it
- Handles thousands of concurrent connections with asynchronous Node.js performance
- Modular plugin architecture for spam filtering, authentication, DKIM signing, and custom logic
- Built-in outbound mail delivery engine with automatic queueing for relay messages
Watch for
Not a complete mail solution—requires separate systems for storage, IMAP, and local delivery
Migration highlight
Spam Filtering Gateway
Deploy Haraka in front of Exchange or Postfix to filter incoming mail through SpamAssassin, DNSBL checks, and custom rules before delivery to the mail store.
Choosing a mail servers & relays alternative
Teams replacing Resend in mail servers & relays workflows typically weigh self-hosting needs, integration coverage, and licensing obligations.
- 2 projects let you self-host and keep customer data on infrastructure you control.
- 3 options are actively maintained with recent commits.
Tip: shortlist one hosted and one self-hosted option so stakeholders can compare trade-offs before migrating away from Resend.