listmonkManage subscriber lists and send newsletter campaigns from your server.
Free self-hosted software · hosting and SMTP delivery cost extra.
Developer tools
Postal
Free softwareOpen sourceLocalBrowser
Send application email through SMTP or an HTTP API on your own infrastructure.
What you can use it for
Send application email through SMTP or an HTTP API on your own infrastructure.
- Full web management UI with real-time delivery graphs and click/open tracking.
- Transactional HTTP API and standard SMTP relay for any backend framework.
- Zero per-email fees regardless of message volume.
Workflow coverage and comparison notes
Complete, full-featured open-source mail delivery platform and transactional SMTP/HTTP API for web applications and servers without recurring SaaS fees. Fully featured open-source mail delivery platform for incoming and outgoing transactional emails without per-thousand send charges. Free open-source mail delivery platform alternative to Resend Pro. Postal gives developers a fully featured SMTP and HTTP transactional email routing server with inbound routing, tracking, and webhooks without per-email volume fees. Requires managing your own IP reputation and SMTP server.
Before you switch
Heavy infrastructure requirements: requires a dedicated Linux server with Docker, MySQL/MariaDB, and RabbitMQ. You must manage IP warm-up, reverse DNS (PTR), SPF, DKIM, and DMARC deliverability yourself.
Alternatives to these paid apps
Each comparison covers the workflow described above, rather than every paid feature.
