Open-Source Email Infrastructure for Developers

Reloop is an open-source email API and infrastructure platform built for developers. It offers transactional and marketing email delivery, SMTP relay, incoming email webhooks, AI agent inboxes, and deliverability tooling, available as both a hosted cloud service and fully self-hosted software.

Unlike traditional closed email services, Reloop is open-source under Apache 2.0. You get full transparency into queues, delivery pipelines, and DNS checks with zero vendor lock-in. You can self-host for free on your own servers or use Reloop Cloud with 3,000 free emails every month.

Reloop provides first-party SDKs for Node.js, TypeScript, Python, Go, Rust, PHP, and Ruby, along with standard SMTP and REST APIs compatible with Next.js, Django, Ruby on Rails, Laravel, and any modern backend.

Yes. Reloop supports critical transactional emails (magic links, receipts, notifications) as well as broadcast marketing campaigns, contact audiences, and deliverability analytics from a unified interface and API.

Yes. Reloop includes webhook-based inbound email routing and dedicated agent inboxes so AI models, automated workflows, and backend services can receive, parse, and respond to incoming emails programmatically.

Each successfully sent email counts toward your monthly quota: transactional messages, campaign sends, and SMTP relay deliveries all use credits the same way.

No. The Free plan includes 3,000 emails per month and 100 emails per day, with no credit card required. Upgrade when your volume grows.

On paid plans, overage emails are billed at $0.50 per 1,000. On the Free plan, sending pauses at 3,000 emails per month or 100 emails per day until the next period unless you upgrade. Free has no overage.

Yes. Reloop is open source under Apache 2.0 with Reloop Labs use restrictions. You can deploy on your own infrastructure at no Reloop license cost: you pay only for your servers and email delivery infrastructure. Self-host is not a Reloop Cloud subscription.

Yes. Reloop Cloud (hosted) uses the published Free, Pro ($10/mo), Growth ($20/mo), and Enterprise tiers. Self-hosting the Apache 2.0 stack has no Reloop SaaS fee: it is not the same as buying those hosted plans for your own servers.

Yes. Upgrade or downgrade from your dashboard. Plan changes apply to the current billing period according to your subscription settings.

You can request a refund within 7 days of billing if you have used at most 2% of your plan's email quota and include a clear reason, such as a missing documented feature, a material service failure on our side, or a billing error. Usage above 2% of quota, refunds requested after 7 days, and accounts suspended for abuse or fraud are not refundable.

Contact reloop.sh@gmail.com within 7 days of the payment date with your account, the charge, your usage, and the reason. Approved refunds go back to the original payment method. Opening a chargeback instead of contacting us is a breach of our Terms.

No. If you are caught sending spam, phishing, scams, or any other abuse, your payment is never refunded, your subscription is auto-cancelled, and your account is suspended. Abuse related terminations carry no refunds, credits, or chargebacks under our Terms.

Reloop Pro is $10 per month for 50,000 emails and Growth is $20 per month for 100,000, with overage at $0.50 per 1,000. Mailgun Basic is $15 per month for 10,000 emails and Foundation is $35 per month for 50,000, with overage from $1.30 per 1,000. SendGrid commonly pushes annual enterprise commits, while Reloop stays on monthly tiers. Full comparisons live on our compare pages.

Resend is a hosted developer layer over Amazon SES focused on transactional sending. Reloop is a full email platform in one codebase: transactional API, SMTP relay, marketing campaigns, contact audiences, inbound webhooks, and agent inboxes. Reloop is not a drop-in Resend proxy, so plan a small client adapter using the x-api-key header when migrating.

Pick SES if you only need raw sending pipes at extreme volume and are happy wiring everything yourself. Pick Reloop when you want the platform around the pipe: REST and SMTP APIs, a delivery dashboard, campaign builder, templates, native webhooks instead of SNS configuration, and support. SES is often cheaper per email at huge scale, while Reloop competes on total platform cost including engineering time.

Mailchimp and Loops charge by contacts stored, so inactive leads cost you money every month. Reloop charges by emails sent, so a quiet list costs nothing extra. Reloop also unifies transactional and marketing sending in one product, while Mailchimp routes transactional through a separate product path.

SMTP senders only change host, port, and credentials. REST senders add a small client adapter, since Reloop is not a drop-in proxy for Mailgun, Resend, or SES SDK calls. First-party SDKs cover Node.js, TypeScript, Python, Go, Rust, PHP, and Ruby, and inbound routes map to Reloop webhook handlers.

Transactional sends, broadcast campaigns, templates, delivery analytics, and agent inboxes live in one interface instead of spread across separate products or CloudWatch and SNS consoles. For pure marketer drag-and-drop workflows, Mailchimp's visual editor is still more mature, so evaluate that with your marketing lead.

No. We do not sell your emails, contact lists, or personal information. On Reloop Cloud, email content is processed only to deliver your mail, operate the service, and keep infrastructure safe, never for advertising or resale.

No. We do not use your hosted email content, recipients, or contact lists to train AI models. Automated checks run only for delivery, security, and abuse prevention.

Only the systems needed to deliver and secure your mail, plus trusted infrastructure providers bound by confidentiality. Human review happens only when necessary, for example a support request you open or an abuse and fraud investigation.

To deliver your mail and protect shared infrastructure. We monitor for abuse, fraud, and security incidents, such as phishing lures, malware, or gateway abuse, so one bad actor cannot destroy IP and domain reputation for every other customer.

No. A self-hosted instance runs entirely on infrastructure you control. Reloop Labs does not receive your email content, contact lists, or delivery logs from your deployment unless you choose to share them, for example in a support request.

We retain data only as long as needed to operate the service: delivery, logs, debugging, and legal obligations. Details are in our Privacy Policy, and you can exercise access, correction, or deletion rights by contacting reloop.sh@gmail.com.

No. Phishing, spoofing, fake payment or invoice lures, crypto and wallet scams, malware, and fraud are strictly prohibited on Reloop Cloud and against our Terms, even if you send from your own domain.

Fake security alerts, invoice or payment lures, brand impersonation, credential and seed-phrase harvesting, crypto and wallet theft narratives, malware distribution, and unsolicited SMS-gateway blasts all count as abuse under our Terms.

Reloop Cloud automatically classifies outbound traffic on shared infrastructure. High-severity sends such as stacked phishing or scam lures can be blocked immediately, while suspicious sends are queued for operator review to protect shared IP and domain reputation.

Only with proper consent and list hygiene. You are responsible for consent, authentication on your domains, bounces, and spam complaints. High complaint rates, blocklist listings, or purchased lists that harm shared deliverability may be throttled or suspended.

Accounts that violate acceptable use may have messages blocked, sending throttled, or API keys, domains, and accounts suspended or terminated without prior notice when delay would increase harm. Abuse-related terminations are not eligible for refunds, and serious cases may be reported to mailbox providers, registrars, or law enforcement.

Medium-severity sends may still be delivered while we investigate. If your sending is throttled or blocked in error, contact support with your account, domain, and a sample message ID so we can review and reclassify it.

Forward the full email with headers to reloop.sh@gmail.com and include the subject, sender, and why it looks abusive. Our team investigates reports of phishing, scams, and spam, and takes enforcement action under our Terms of Service.