Every transactional email your product depends on, delivered through one modern API. Built-in deliverability monitoring. A developer experience that respects your time.
No credit card. 3,000 emails per month, free forever.
Trusted by developers shipping at startups, agencies, and growing engineering teams worldwide.
Works with
Built for developers
Send your first transactional email in 30 minutes. Not three days.
Three free environments from day one. Production, staging, and development, with separate API keys and separate sending limits. No accidental customer emails from your laptop.
Works with Python, Node, PHP, Ruby, Go, Rust, or any language that can make an HTTP call. Send via REST API or standard SMTP relay on ports 587 and 465.
Webhook events for every email lifecycle moment. Delivered, opened, bounced, complained. Retry-safe, signed, and fully documented.
import flashpost
flashpost.api_key = "fp_live_..."
flashpost.Email.send(
to="user@example.com",
from_email="hello@yourapp.com",
subject="Your order is on the way",
template_id="order_shipped",
variables={
"name": "Sarah",
"order_id": "ORD-8821"
}
)No proprietary email language to learn. No support ticket needed to send a test message. Just send.
The problem
Bounce rates climb. Spam complaints appear. Inbox placement quietly drops. Most providers hand you the numbers but never the reasons. You are left debugging in the dark while your customers stop receiving the emails your product depends on.
The free plans developers built their products on either expired overnight or quietly vanished. Overage charges hit your bill without warning. Basic deliverability tools sit behind enterprise pricing. The model stopped supporting your growth and started squeezing it.
Slow pages. Cluttered menus. Setup flows that assume you have a deliverability expert sitting next to you. The tools work, but they feel built for the way teams shipped software ten years ago, not the way they ship today.
What FlashPost does
FlashPost is a transactional email service for developers and the teams that ship with them. It delivers the emails your product depends on, customer-facing and internal, through a single modern API and a standard SMTP relay.
Order confirmations, password resets, account verifications, one-time passwords, payment receipts, shipping notifications, and account activity alerts. The emails your customers expect, delivered when they expect them.
Deployment notifications, server alerts, CI/CD pipeline updates, monitoring digests, scheduled reports, cross-system automation, and infrastructure status emails. The emails your engineering and operations teams rely on to keep the lights on.
Whether you are sending one email a day or one million, FlashPost handles authentication, queuing, retries, suppression management, and reporting so your team can focus on what they actually need to build.
Use cases
Deliver one-time passwords, password reset links, two-factor authentication codes, and email verification messages with sub-three-second delivery times. Critical for fintech, SaaS, e-commerce, and any product where account security is non-negotiable.
Send order receipts, payment confirmations, shipping updates, and refund notifications using reusable email templates and real-time webhook events that keep your application in sync with delivery state.
Trigger emails for new logins, security alerts, plan changes, billing updates, and engagement messages. Every email logged, searchable, and provable.
Route deployment notifications, error alerts, uptime monitoring messages, and on-call escalations through a single email API. Replace the brittle SMTP server you have been quietly maintaining for three years.
Send daily digests, scheduled metrics reports, weekly summaries, and cross-team automation emails directly from your applications, scripts, or workflow tools.
Notify your engineering team on pipeline failures, build completions, security scan results, and release events. Webhook-driven, retry-safe, signed, and documented.
Features
A letter grade from A+ to F that summarises your sender reputation in one glance. Updated daily. Gets specific the moment something starts to drift, with clear guidance on exactly what to fix.
Native integration with Gmail Postmaster Tools, surfaced directly inside the FlashPost dashboard. See exactly how Gmail views your domain reputation, spam rate, and authentication signals without leaving the platform.
Run real inbox placement tests across major mailbox providers before you send. Know whether your email lands in the inbox or spam, before your customers do. Included free, not gated behind a higher tier.
Own your sender reputation with a dedicated IP and a managed 30-day warming schedule. Built for fintech, healthcare, and any team that cannot afford to share an IP with strangers.
Real-time notifications for every delivery, open, click, bounce, and complaint. Signed, retried, and fully documented. Built for production systems that need to react the moment an email changes state.
Every email you send recorded, searchable, and exportable. Free at every plan level. Required in regulated industries. Useful in every industry.
Automatic bounce and unsubscribe handling. Stay GDPR-compliant and protect sender reputation without writing custom logic.
Reusable templates with placeholders for personalization. Edit once, send everywhere, versioned in your dashboard.
Owner, Admin, Member, and Viewer roles. Add your engineering, marketing, and operations teammates with exactly the access they need.
Resilience built in
Most providers send your email once. If it gets rate-limited, throttled, or deferred, your message sits in a queue while your customers wait. FlashPost detects the failure, re-routes through a relay pool, and delivers anyway.
Message submitted via SMTP or API. Routes to your dedicated IP.
No alerts. No downtime. No 3am Slack message. Your emails just get delivered.
IP warming
Send too much too soon on a new IP and Gmail flags you as a spammer. Send too little and your IP never builds reputation. FlashPost handles the entire 30-day warming schedule automatically, so your reputation builds instead of breaks.
No manual scheduling. No deliverability expert needed. On autopilot from day one.
Routing modes
Three routing strategies for three different scales. Pick the one that fits your sending volume today, switch as you grow.
Why FlashPost
Most email service providers were built for the marketing world, with transactional features bolted on later. FlashPost was created the other way around. Transactional email is the core. Everything else is a layer on top.
3,000 emails per month, every month, with no credit card and no expiration. Build, test, and ship without ever watching a meter.
Three independent signals tell you where your sender reputation stands at any moment. No guessing, no waiting for a support reply, no surprises in your bounce rate.
Production, staging, and development isolation, with separate API keys and separate sending limits. The way it should have been from the start.
Built for the way teams ship software in 2026. Fast pages, fast onboarding, no learning curve, no manuals.
Other providers gate this behind enterprise pricing. FlashPost includes it on the free tier, because proof of delivery should not be a premium feature.
Most email APIs are designed for one direction, outbound to customers. FlashPost works just as well for internal alerts, system reports, and team automation, so one platform covers every email your team sends.
Pricing
Same features at every tier. The only thing that changes is your sending volume and your support level. Choose the plan that fits today, upgrade when you grow.
Need more than the Pro plan offers? Talk to us about Enterprise with custom pricing, dedicated CSM, and SSO.
Whether your product needs to deliver a million OTPs to customers or alert your engineering team the moment production goes down, FlashPost handles the email so you can handle the product.