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About

OpenMail gives AI agents a dedicated email address. Provision an inbox with one CLI command or API call, each agent gets its own address, not a shared inbox or forwarding alias. Inbound email arrives instantly via webhook or WebSocket, parsed and threaded, with no polling required. Replies land in context so agents can respond without any new interface on the human side. Attachments: PDFs, CSVs, images, spreadsheets, Word documents are automatically converted to LLM-ready text; the agent never touches raw MIME. The API is small by design: one call to provision, standard calls to send, webhooks or WebSocket to receive. Integrates with LangChain, n8n, Make, Vercel AI SDK, and OpenClaw. Custom domains supported. Runs in the EU, GDPR-covered, 99.9% uptime SLA, SOC 2 in progress.

About

Resend is a cloud-based email delivery platform that enables developers and businesses to send transactional and marketing emails through APIs, SDKs, and SMTP. The platform supports automated emails such as account verification messages, password resets, notifications, receipts, and customer communications. Its developer tools include a REST API, software development kits for multiple programming languages, and React Email integration for building reusable email templates. Resend also provides marketing email capabilities, including contact management, audience segmentation, broadcast campaigns, and a visual email editor. Email monitoring features include delivery tracking, open and click analytics, bounce reporting, webhooks, and detailed API logs. The platform offers domain authentication, deliverability monitoring, dedicated IP addresses, and automated workflows to help organizations manage email communications at scale.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Developers, AI agent companies, software companies innovating with agentic technology

Audience

Software developers, SaaS companies, startup founders, application engineers, DevOps teams, product teams, digital marketers, ecommerce businesses, and organizations seeking programmable email delivery, transactional messaging, marketing automation, contact management, and email performance monitoring

Support

Phone Support Not Supported
24/7 Live Support Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Not Supported

API

Offers API Supported

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

9 EUR
Free Version Supported
Free Trial Not Supported

Pricing

$20 per month
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 5.0 / 5
ease 4.0 / 5
features 5.0 / 5
design 5.0 / 5
support 5.0 / 5

Reviews/Ratings

Overall 4.0 / 5
ease 5.0 / 5
features 5.0 / 5
design 4.0 / 5
support 4.0 / 5

Pros & Cons from Real Users

Pros

  • I was playing with OpenClaw quite a bit when I hit a roadblock, which is it can't sign up to services? Luckily, OpenMail was here to help, I own them one.

Cons

  • The onboarding was a bit tricky with so many integrations to choose from. But I got some help from Discord, fast responses too.

Pros & Cons from Real Users

Pros

  • Having the ability to send transactional emails via API makes integrating Resend into an application significantly easier. We set up Resend to handle key transactional emails such as verifying accounts, sending forgot password emails and notifications about usage in our customer accounts. It was easy for our developers to integrate and the pricing scales nicely.

Cons

  • To be honest as long as you know that Resend is designed for transactional emails, and not marketing emails, there's no major negatives of the platform itself. I would have given it 5 stars, but the jump in pricing to have 7 day data retention is higher than I would have liked.

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

OpenMail
Founded: 2026
Lithuania
Openmail.sh

Company Information

Resend
Founded: 2023
United States
resend.com

Alternatives

Alternatives

BlueFox Email

BlueFox Email

Innovaris Group

Categories

Email APIs Supported

Categories

Email APIs Supported

Integrations

AutoSend Not Supported
Brikone Not Supported
Codepilot Not Supported
ElectroNeek Not Supported
Embeddable Not Supported
Grok Bot Not Supported
Indie Kit Not Supported
Indie Starter Not Supported
LangChain Supported
Marengo Not Supported
MassageHub Not Supported
Rebolt.ai Not Supported
Supastarter Not Supported
Tokei Not Supported
UnderPeaks Not Supported
Velt Not Supported
Vercel Supported
Webdone Not Supported
Webleadr Not Supported
Workers by Delos Not Supported

Integrations

AutoSend Supported
Brikone Supported
Codepilot Supported
ElectroNeek Supported
Embeddable Supported
Grok Bot Supported
Indie Kit Supported
Indie Starter Supported
LangChain Not Supported
Marengo Supported
MassageHub Supported
Rebolt.ai Supported
Supastarter Supported
Tokei Supported
UnderPeaks Supported
Velt Supported
Vercel Not Supported
Webdone Supported
Webleadr Supported
Workers by Delos Supported
Claim OpenMail and update features and information
Claim OpenMail and update features and information
Claim Resend and update features and information
Claim Resend and update features and information