An email API with a great dashboard and searchable logs.

Email API

Send email via our simple cloud API, from any programming language or software.

We handle bounces, webhooks, delivery errors, retry mechanisms, etc. so you don't have to.

We also support SMTP access, so you can just drop-in credentials to any SMTP library or application.

Email Search Engine

Quickly find any email that was sent or received through any of your APIs.

We are the first (and only) email API to offer full-text-body searchable logs. We understand the importance of being able to follow-up on your customers, and maintain independent logs for auditing, debugging and compliance.

We even store attachments, and provide direct API access for extracting, analyzing, and exporting data.

1-Click Integrations

Pop in your API keys and you'll be sending email in minutes through SendGrid, Mailgun, Amazon SES, SparkPost, Postmark or any SMTP server.

We integrate deeply with each of these providers to handle bounces, webhooks, delivery errors, callbacks and all of that fancy stuff so you don't have to.

Easy Segmentation

Tired of problems managing and unsubscribing from different types of email? Flute makes it easy to isolate your marketing, transactional, and critical/personal emails.

If you don't segment, we strongly recommend it. Because segmentation makes it so much easier to manage a good email program. And your marketing email reputation with potential spam complaints should not affect your critical email deliverability.

With Flute you can even send different types of email through different providers. You might want to send critical emails through Postmark and marketing through SendGrid, for example.

Advanced Features

For optimizing email delivery at massive scale. Designed for sophisticated DevOps teams.

Smart Failover™

If a single critical email fails to deliver, how much does that cost your business?

Flute relays and verifies every single outbound email, listens for delivery problems, and automatically takes action by safely rerouting individual emails through a backup provider, whenever possible (without creating duplicates).

We detect certain types of spam bounces, all kinds of API errors, provider downtime, and other sporadic delivery issues.

Kibana Analytics

Flute comes built-in with access to pre-configured Kibana dashboards, the world's most popular open-source log analytics platform.

We aggregate and simplify the vast myriad of complicated events (bounces, errors, opens, etc.) from multiple providers into one simple data point: SUCCESS or FAIL.

A/B Testing FROM

Your email FROM is probably the single most important factor in deliverability and reputation. Now you can easily see if your provider or domain is giving you a bad rep.

Test and measure sending from different providers or domains to compare performance and deliverability, without needing to write a single line of code.

Always Improving Toolset

Our team enjoys working on email delivery, to the point that it has become an obsession. As a focused, nimble team, we are constantly iterating on our platform, bringing modern features to your delivery API, while monitoring and improving our core reliability and deliverability functions, especially Smart Failover.

Scalable API Infrastructure

Designed to handle the world’s mission-critical email, Flute uses state-of-the art AWS-deployed infrastructure trusted by the world's largest brands. We are bound to our promise to be the most reliable solution for your email, and eventually we plan to build globally redundant availability zones for unparalleled performance and uptime.


Ready to start sending?
Free to sign up during public beta.

If you sign up before May 15, 2018, you'll get a free-tier plan that stays free forever. Also, we'll throw in a complimentary one-on-one consultation to ensure you're making the most of your email program.