Top 23 smtp-server Open-Source Projects

• maildev

  8 4,786 4.8 SCSS

  :mailbox: SMTP Server + Web Interface for viewing and testing emails during development.

  

Project mention: MailDev is a simple way to test a project's generated email during development | news.ycombinator.com | 2023-09-08

• Mailpit

  8 4,527 9.6 Go

  An email and SMTP testing tool with API for developers

Project mention: .test | news.ycombinator.com | 2024-04-28

Yep, mailhpg works, but is not anymore maintained.

We have been successfully using https://github.com/axllent/mailpit

• InfluxDB

  www.influxdata.com featured

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• smtp4dev

  5 2,797 9.3 C#

  smtp4dev - the fake smtp email server for development and testing

Project mention: Solutions for selfhosted internal-only email? | /r/selfhosted | 2023-06-26

• Papercut

  3 2,793 4.8 JavaScript

  Papercut SMTP -- The Simple Desktop Email Server

  

Project mention: WTD: Temp SMTP account and relay | /r/sysadmin | 2023-05-24

Do you need it to actually send, or just receive for testing? Because if it's testing you need then you should look into paper cut SMTP. https://github.com/ChangemakerStudios/Papercut-SMTP

• inbucket

  10 1,549 8.8 Go

  Disposable webmail server (similar to Mailinator) with built in SMTP, POP3, RESTful servers; no DB required.

  

• mailslurper

  1 1,374 3.3 JavaScript

  Local, web-based mail server application. Slurp mails into oblivion!

  

Project mention: Trap and test AWS SES emails locally | news.ycombinator.com | 2023-11-19

Yeah thanks for this, I’ve been using it for years! Recently switched to mailslurper:

https://github.com/mailslurper/mailslurper

• postfixadmin

  4 980 8.4 PHP

  PostfixAdmin - web based virtual user administration interface for Postfix mail servers

  

• SaaSHub

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• Exim

  9 699 9.2 C

  Exim Mail Transport Agent - source, testsuite and documentation

  

Project mention: Is it right to blame Google/Yahoo for deprecating an email forwarding service? | news.ycombinator.com | 2024-01-14

Documentation for ARC is pretty sparse.

The instructions for setting it up in Exim (default MTA on Debian systems) can be found here: https://github.com/Exim/exim/blob/master/doc/doc-txt/experim...

(AFAICT, there is absolutely no mention of ARC in the main Exim documentation: https://exim.org/docs.html)

• salmon

  0 630 2.0 Python

  A Python Mail Server

• docker-smtp

  1 537 0.0 Shell

  SMTP docker container (by namshi)

  

• smtp2http

  3 495 1.7 Go

  A tiny software that receive a smtp request (email) and send it to the specified webhook as a http post request

• docker-postfix

  6 470 8.6 Shell

  Simple SMTP server / postfix null relay host for your Docker and Kubernetes containers. Based on Alpine Linux.

• smtprelay

  7 400 6.8 Go

  Simple Golang SMTP relay/proxy server

• docker-postfix

  1 320 2.1 Shell

  Simple SMTP relay docker image. (by juanluisbaptiste)

• aiosmtpd

  3 301 8.5 Python

  A reimplementation of the Python stdlib smtpd.py based on asyncio.

  

Project mention: How to Test Emails in Your Python App | dev.to | 2024-01-07

Aiosmtpd is a library that lets you set up a local SMTP (Simple Mail Transfer Protocol) server. This will create a testing environment and handle email traffic internally. So, your test emails won’t reach the recipients. Refer to aiosmtpd’s GitHub page for more information.

• notqmail

  1 301 7.7 C

  The collaborative Open Source successor to qmail and netqmail

  

• Maildroid

  0 183 0.0 Kotlin

  Maildroid is a small robust android library for sending emails using SMTP server

• kumomta

  4 179 9.8 Rust

  The first Open-Source high-performance MTA developed from the ground-up for high-volume email sending environments.

  

Project mention: Ask HN: What Underrated Open Source Project Deserves More Recognition? | news.ycombinator.com | 2024-03-07

I've been using KumoMTA for the past 3 months and it's one of the most well thought-out, stable and fast softwares I've ever used.

https://kumomta.com/

• docs

  2 136 7.9 TypeScript

  📚 Documentation for the Postal mail server! (by postalserver)

  

Project mention: Stalwart mail server (self-hosted all-in-one mail server) now as an admin webui | news.ycombinator.com | 2024-04-09

I've been using Postal Server for 2 years ( https://docs.postalserver.io/ ) sending around 50k emails / day without any issue.

Just make sure you set up everything (SPF, DKIM, DMARC) correctly, including the PTR reverse lookup of your server ( really important ).

Key tip: warm up your ip(s). I use mailreach.co ( it has a USD 25/m cost ), reached near 100% deliverability in a month.

I now have barely have any maintenance to do. It just works.

• yggmail

  1 130 7.7 Go

  End-to-end encrypted email for the mesh networking age

• go-smtp-mock

  0 116 6.7 Go

  SMTP mock server written on Golang. Mimic any 📤 SMTP server behavior for your test environment with fake SMTP server.

  

• postfix-relay

  2 112 6.4 Shell

  Postfix SMTP relay docker image

• ControlCenter

  11 93 3.2 Go

  Mirrored from GitLab! Monitoring and automation for Open Source email servers, starting with Postfix. Please do not submit issues or PRs here - join us at: https://gitlab.com/lightmeter

  

• SaaSHub

  www.saashub.com featured

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smtp-server related posts

• .test

  2 projects | news.ycombinator.com | 28 Apr 2024

• How to Test Emails in Your Python App

  1 project | dev.to | 7 Jan 2024

• Outlook/Hotmail is no longer blocking my mail server

  1 project | news.ycombinator.com | 28 Dec 2023

• Mailpit – email and SMTP testing tool with API for developers

  1 project | news.ycombinator.com | 24 Nov 2023

• Trap and test AWS SES emails locally

  4 projects | news.ycombinator.com | 19 Nov 2023

• Mailpit – a better way for email testing

  6 projects | news.ycombinator.com | 23 Jun 2023

• Mailpit An email and SMTP testing tool with API

  1 project | /r/hypeurls | 23 Jun 2023
• A note from our sponsor - InfluxDB
  www.influxdata.com | 3 May 2024

  Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality. Learn more →

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