Reloop

Reloop is an open-source email platform for teams that need transactional sending, agent inboxes, and automated email workflows in one system. It gives developers a unified way to send, track, and manage application email without being locked into a proprietary setup, with the option to use it as a hosted service or deploy it yourself.

The platform brings transactional email infrastructure, inbound handling, delivery monitoring, templates, automation, and integrations together in one developer-focused workspace. This makes it suitable for product teams sending welcome emails, password resets, invoices, alerts, lifecycle messages, and other application-driven communications.

Key Features

Send API and SMTP

Send transactional emails directly from applications, services, or scheduled jobs using the Send API or SMTP.

• API-based transactional sending
• SMTP support
• Suitable for code and cron jobs
• SDK support across common programming languages
• Framework-friendly email sending

Inbound Agent Inboxes

Reloop also handles incoming email through inboxes designed for agent-style workflows. This gives teams a way to manage inbound email alongside the infrastructure used to send application messages.

It can be useful for workflows where email needs to be received, processed, and connected to automated actions.

Webhooks and Email Events

Connect email activity to the rest of your application through webhooks. Reloop provides events for important delivery and engagement signals, including:

• Deliveries
• Opens
• Clicks
• Bounces

These events can feed internal workflows, monitoring systems, or other services in your stack.

Email Analytics

Track email performance and infrastructure health through analytics covering delivery, engagement, reputation, and failures.

This gives teams more visibility into how messages are performing and helps identify problems when email delivery or engagement changes.

Templates and React Email

Build and manage email templates directly within the platform. Reloop supports React Email for teams that prefer working with code-based email templates.

The platform also includes live previews and version history, making it easier to create, review, and revise transactional messaging.

AI Email Template Generation

Reloop includes AI-assisted template creation. You can describe the email you want in plain language, generate a template, and then edit the result with a live preview.

This can simplify the creation of common application emails while keeping the final content editable and versioned within the platform.

Automated Email Workflows

Create lifecycle sequences and rule-based follow-up workflows from the same infrastructure used for sending email.

This allows product teams to connect transactional sending with automated customer lifecycle communication without maintaining separate systems for each workflow.

Contacts and API Keys

Organize contacts and manage API access within the platform. API keys provide a way to connect applications and services to Reloop while keeping sending infrastructure centralized.

Integrations

Connect Reloop with an existing technology stack through its integrations and developer-focused tooling rather than rebuilding email infrastructure around a standalone system.

Built For Developer Teams

Reloop is designed primarily for developers and product teams that want control over their email infrastructure. Its API, SMTP support, SDKs, React Email compatibility, webhooks, and self-hosting option make it suitable for teams that want email to fit directly into their existing application stack.

It can support both straightforward transactional messages and more involved workflows involving inbound mail, automation, analytics, and delivery monitoring.

Deliverability and Email Infrastructure

Deliverability is a core part of the platform. Reloop provides tools for monitoring and maintaining email infrastructure, including blocklist tracking, DMARC, DKIM key rotation, strict TLS delivery, suppression handling, and bounce diagnostics.

It also includes IP and domain monitoring and automated IP warmup. Together, these features provide visibility into reputation and delivery health while helping teams diagnose issues when messages fail or inbox placement becomes a concern.

Common Use Cases

Transactional Application Email: Send welcome messages, password resets, invoices, alerts, and other application-generated emails through the Send API or SMTP.

Customer Lifecycle Messaging: Build automated sequences and rule-based follow-ups for different stages of the customer lifecycle.

Agent Email Workflows: Use inbound inboxes for workflows where agents need to receive and handle email.

Email Infrastructure Monitoring: Track delivery, engagement, reputation, bounces, failures, IPs, domains, and blocklists.

Developer-Managed Templates: Create and manage transactional email templates using React Email and live previews.

Self-Hosted Email Infrastructure: Deploy the open-source platform yourself when greater control over the email stack is required.

Hosted or Self-Hosted

Reloop can be used as a hosted service or deployed independently. This gives teams a choice between using a managed setup and maintaining the platform within their own infrastructure.

For developers who want an open-source alternative to proprietary email infrastructure, the self-hosting option provides another way to keep the email stack under their control.

Why It Matters

Application email often requires more than simply sending a message. Teams need delivery events, bounce handling, reputation monitoring, templates, inbound workflows, automation, and integrations to understand and manage what happens before and after an email is sent.

Reloop brings these functions together around an open-source, developer-first platform. Instead of maintaining separate tools for transactional sending, inbound email, templates, analytics, and lifecycle automation, teams can manage these workflows through the same email infrastructure.

Build and Manage Email Workflows With Reloop

Send transactional email through an API or SMTP, handle inbound agent inboxes, monitor delivery and reputation, create templates, and automate lifecycle workflows from one open-source email platform. With hosted and self-hosted deployment options, Reloop gives developer teams more control over how application email is sent, tracked, and managed.