What is Reloop used for?

Reloop is an open-source, self-hostable email platform for developers with a transactional email API, SMTP relay, campaigns, webhooks and inboxes for AI agents. It is a good fit for developers replacing SES or SendGrid in an app and giving an AI agent its own email inbox.

Yes. Reloop has a free plan. Free sends 3,000 emails a month. Pro costs $10 and Growth $20 per month; pay-as-you-go credits are $5 per 10,000 emails, and Business is custom. Self-hosting is free.

Is Reloop open source?

No. Reloop is proprietary (closed-source) software. In the Email Marketing category, open-source options include Postal, Plunk and Listmonk.

Can I self-host Reloop?

Yes. Although Reloop is closed source, it can be self-hosted on your own servers, and the vendor also offers a hosted version.

What are some alternatives to Reloop?

Reloop competes with Resend, SendGrid and Amazon SES.

Reloop: features, pricing and alternatives

About Reloop

Reloop is open-source email infrastructure that can be self-hosted or used as Reloop Cloud, described as an alternative to AWS SES, SendGrid and Resend. It offers a transactional email API, an SMTP relay on ports 587 and 465 with TLS, campaigns, webhooks and dedicated inboxes for AI agents, plus a developer CLI for sending and testing from a terminal.

An MCP server lets Claude, Cursor or Codex send and manage email, with the idea that you can ask an agent to set up email for an app. Deliverability features include SPF, DKIM and DMARC authentication, IP reputation and warmup management and blocklist tracking. Contacts are stored without an audience fee, and you pay only for emails sent, either on a monthly plan or with credits that last three months on a rolling basis. The site publishes llms.txt and markdown versions of its docs.

Key features

Transactional email API
SMTP relay with TLS
Campaigns with unlimited stored contacts
Inboxes for AI agents
MCP server and developer CLI
SPF, DKIM and DMARC authentication
Self-hostable open-source code

Good fit for

Developers replacing SES or SendGrid in an app
Giving an AI agent its own email inbox

Tags: email-api; smtp; open-source; self-hosted; transactional-email; mcp; developer-tools

Reloop: questions and answers

What is Reloop used for?: Reloop is an open-source, self-hostable email platform for developers with a transactional email API, SMTP relay, campaigns, webhooks and inboxes for AI agents. It is a good fit for developers replacing SES or SendGrid in an app and giving an AI agent its own email inbox.
Is Reloop free?: Yes. Reloop has a free plan. Free sends 3,000 emails a month. Pro costs $10 and Growth $20 per month; pay-as-you-go credits are $5 per 10,000 emails, and Business is custom. Self-hosting is free.
Is Reloop open source?: No. Reloop is proprietary (closed-source) software. In the Email Marketing category, open-source options include Postal, Plunk and Listmonk.
Can I self-host Reloop?: Yes. Although Reloop is closed source, it can be self-hosted on your own servers, and the vendor also offers a hosted version.
What are some alternatives to Reloop?: Reloop competes with Resend, SendGrid and Amazon SES.