Dev tools · alternatives · 2026
24 alternatives to sendthen
Open-source email infrastructure you run yourself
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
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Unosend▲205Send transactional + marketing email w/ 99.9% deliverability
Dec 2025 · unosend.co · its alternatives →
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Sidemail 2.0▲306Hi all! I'm Kristyna, maker of Sidemail. I'd love to share with you what we've been building. We built Sidemail because sending emails from a SaaS app was way harder than it should be. Sidemail is made for developers and teams that want one simple place to handle SaaS emails with reliable delivery and no bloat. It has: - Everything for creating, managing and delivering SaaS emails in one platform, - Easy-to-use email API for sending password resets, receipts, etc. - Messenger for writing product updates and newsletters, - Email automations for onboarding and lifecycle flows, - Fast email…
Nov 2025 · sidemail.io · its alternatives →
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inbound ▲227Hey HN! I've been working on Inbound (inbound.new) - an email system that lets you programmatically manage email addresses and route them to AI agents, webhooks, or forward them anywhere. The core idea: instead of manually managing email addresses, you create them on-demand via API and route incoming emails to your AI agents or other automated systems. For AI Agents: Create [email protected] and emails get sent to your AI agent as webhooks. Your agent can reply using our SDK. Perfect for AI customer support or automated responses. For Email Forwarding: Set up [email protected] to…
2025 · inbound.new · its alternatives →
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Everything you need to start sending newsletters, drip campaigns, transactional emails. Mailcoach is a fully featured email marketing platform built for growing creators, developers, and businesses.
2020 · mailcoach.app · its alternatives →
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Interseller▲174Find an email, send a message, and sync your CRM in a click
2017 · interseller.io · its alternatives →
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A free service to send transactional emails through Gmail
2022 · gmass.co · its alternatives →
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It's a self-hosted mailbox for all emails coming to your own domains, with Web interface and CLI included. Notes: - all emails share the same inbox, as long as set your DNS correctly - Web client via self-hosted Docker or Cloudflare Pages - need additional access controls, may use Basic Auth or Forward Auth with Cloudflare deployment
2024 · github.com · its alternatives →
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SendgoMail▲88Email sending made easy & affordable for free
2021 · sendgomail.com · its alternatives →
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UniqMail▲86Revolutionize emailing with AI customization with Free App
2024 · arcade.now · its alternatives →
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Introducing Posthorn, a self hosted email gateway. One docker container (or Go binary) between every self hosted app on your VPS and your transactional email provider. Set up Posthorn once, point your apps to it, done. I was trying to deploy Ghost on a DigitalOcean droplet and found that DO and many different VPS services have started to block the default SMTP ports to try to combat the various types of abuse they get. To actually configure my app, I had to hack together a Postfix relay. In another project, I had a static site which had a contact form, but my free Formspree account was…
May 2026 · github.com · its alternatives →
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Hi HN, I host my own mail infrastructure and don't rely on third-party tools to send my mails. But in a microservice architecture, managing all the SMTP configs quickly becomes tiresome. After a while I'd always have my credentials and settings scattered in application-properties, bash scripts and environment files. So I've build Brieferl, an app where you can add your SMTP servers and send emails through a single API with a simple JSON payload. You also get logs of when/where emails were sent and HTML previews of messages. I am interested in what you guys think about this. You can…
2025 · brieferl.com · its alternatives →
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Robust and flexible email library for Go. Contribute to jordan-wright/email development by creating an account on GitHub.
2014 · github.com · its alternatives →
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Sendwithus helps teams manage transactional emails outside of source code — leading to streamlined workflows and always on-brand emails. Learn more here!
2014 · sendwithus.com · its alternatives →
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Unitpost▲26Email component library that works in Outlook, Gmail, and Apple Mail. MIT. Install with npm or a Skill. No account.
Sep 2026 · unitpost.com · its alternatives →
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One of my favorite developer tool companies in the world is Charm. So I was blown away when they said they were rethinking how email could be sent using the terminal. Pop is a Text-based User Interface (TUI) that allows you to send emails without having to switch context from your command-line interface. Here's why I'm obsessed with Pop: 1. You can write an email body with AI 2. You can easily install using Homebrew 3. You can do some really powerful stuff like generating a PDF and sending an invoice via email entirely from the command line The email sending part is taken care by Resend,…
2023 · github.com · its alternatives →
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cold0 - bring your own SMTP cold email sending and managing
Feb 2026 · cold0-gamma.vercel.app · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →