MailDev - SMTP Server + Web Interface for viewing and testing emails during development

•    Javascript

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MailDev is a simple way to test your project's generated emails during development with an easy to use web interface that runs on your machine built on top of Node.js.

testing docker development smtp developer-tools smtp-server mailcatcher nodemailer smtp-sink test-mail-server testing-tool

mhsendmail - sendmail for MailHog

•    Go

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A sendmail replacement which forwards mail to an SMTP server.

smtp-server smtp-relay send-mail sendmail-alternative testing-tool test-mail-server

MailCatcher - Catches mail and serves it through a dream

•    Ruby

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MailCatcher runs a super simple SMTP server which catches any message sent to it to display in a web interface. Run mailcatcher, set your favourite app to deliver to smtp://127.0.0.1:1025 instead of your default SMTP server, then check out http://127.0.0.1:1080 to see the mail that's arrived so far.

smtp-server smtp mail-server smtp-sink test-framework testing-tool test-mail-server

Mail-in-a-Box - One click easy-to-deploy SMTP server

•    Python

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Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box. Mail-in-a-Box lets you become your own mail service provider in a few easy steps. It’s sort of like making your own gmail, but one you control from top to bottom. Technically, Mail-in-a-Box turns a fresh cloud computer into a working mail server. But you don’t need to be a technology expert to set it up.

smtp email mail server smtp-server mail-server spf dkim dmarc spam-filtering email-server

Papercut-SMTP - Papercut SMTP -- The Simple Desktop Email Server

•    Javascript

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If you ever send emails from an application or web site during development, you're familiar with the fear of an email being released into the wild. Are you positive none of the 'test' emails are addressed to colleagues or worse, customers? Of course, you can set up and maintain a test email server for development -- but that's a chore. Plus, the delay when you are waiting to view new test emails can radically slow your development cycle. Papercut SMTP is a 2-in-1 quick email viewer AND built-in SMTP server (designed to receive messages only). Papercut SMTP doesn't enforce any restrictions how you prepare your email, but it allows you to view the whole email-chilada: body, html, headers, attachment down right down to the naughty raw encoded bits. Papercut can be configured to run on startup and sit quietly (minimized in the tray) only providing a notification when a new message has arrived.

testing development server email smtp smtp-server papercut development-tools

James - Enterprise Mail Server

•    Java

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James (a.k.a Java Apache Mail Enterprise Server) is a 100% pure Java SMTP and POP3 Mail server, and NNTP News server designed to be a complete and portable enterprise mail/messaging engine solution based on currently available open messaging protocols.

mail-server email-server enterprise mailing-list smtp lmtp pop3 nntp imap mta mail-delivery-agent

Maddy - Composable all-in-one mail server

•    Go

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Maddy Mail Server implements all functionality required to run a e-mail server. It can send messages via SMTP (works as MTA), accept messages via SMTP (works as MX) and store messages while providing access to them via IMAP. In addition to that it implements auxiliary protocols that are mandatory to keep email reasonably secure (DKIM, SPF, DMARC, DANE, MTA-STS). It replaces Postfix, Dovecot, OpenDKIM, OpenSPF, OpenDMARC and more with one daemon with uniform configuration and minimal maintenance cost.

mail-server email-server smtp-server mail imap smtp spf dkim dmarc

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

•    Go

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MailSlurper is a small SMTP mail server that slurps mail into oblivion! MailSlurper is perfect for individual developers or small teams writing mail-enabled applications that wish to test email functionality without the risk or hassle of installing and configuring a full blown email server.

email-server mail-server smtp

greenmail - Official master for the Greenmail project

•    Java

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GreenMail is an open source, intuitive and easy-to-use test suite of email servers for testing purposes. Supports SMTP, POP3, IMAP with SSL socket support. GreenMail also provides a JBoss GreenMail Service. GreenMail is the first and only library that offers a test framework for both receiving and retrieving emails from Java.

mail-server email-server test-mail-server test-framework testing-tool sandbox

Docker Mailserver - A fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) using Docker.

•    Shell

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A fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.). Only configuration files, no SQL database. Keep it simple and versioned. Easy to deploy and upgrade.

letsencrypt docker ssl ldap mail postfix imap smtp dovecot spamassassin antivirus fail2ban antispam mailserver opendkim amavis postgrey opendmarc docker-mailserver saslauthd-ldap smtp-server email-server mail-server

go-smtp - An SMTP client & server library written in Go

•    Go

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An ESMTP client and server library written in Go. It supports SMTP AUTH and PIPELINING, UTF-8 support for subject and message and LMTP support.

mail server client smtp smtp-server smtp-client smtp-library

magento2-gmail-smtp-app - Configure Magento 2 to send email using Google App, Gmail, Amazon Simple Email Service (SES), Microsoft Office365 and many other SMTP (Simple Mail Transfer Protocol) servers

•    PHP

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Configure Magento 2 to send all transactional email using Google App, Gmail, Amazon Simple Email Service (SES), Microsoft Office365 or other SMTP server. Sending transactional emails to customers is a vital part of running an e-commerce store. Our free custom Magento extension integrates with all major email service provider and third-party SMTP server to reliably deliver messages in customers' inbox.

magento-2 magento2-extension gmail-smtp gmail ses smtp smtp-server magento custom-smtp office365 amazon-ses amazon mailgun mandrill hotmail sendgrid email elastic-email mailchimp mailserver

Mailias

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Mailias makes testing of email enabled applications easier for DEVs and QAs. You no longer need to have multiple "real" email addresses to test and validate registration and notification features. You can alias many email address and have your own Mailias. Written in C# thi...

alias development-tool email-management email-server mail-server smtp smtp-server

Haraka - A fast, highly extensible, and event driven SMTP server

•    Javascript

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Haraka is a highly scalable node.js email server with a modular plugin architecture. Haraka can serve thousands of concurrent connections and deliver thousands of messages per second. Haraka and plugins are written in asynchronous JS and are very fast. Haraka has very good spam protection (see plugins) and works well as a filtering MTA. It also works well as a MSA running on port 587 with auth and dkim_sign plugins enabled.

smtp mta spf dkim email mail-server smtp-server mail-transfer-agent smtp-relay

C# Email Server - SMTP and POP3 Email Server in CSharp

•    CSharp

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C# Email Server (CES). Implements SMTP and POP3 components that can be used as a standalone server or as components in other applications. It is a port of the Java Email Server (JES). This component allows a program to accept incoming emails and process them using user defined logic.

smtp-server smtp pop3 mail-server email-server email

Citadel

•    C

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Citadel is a collaboration suite (messaging and groupware). It provides support for Email, Calendaring/Scheduling, Address books, Bulletin boards, Mailing List Server, Instant Messaging, Wiki, Multiple domain support.

mail-server groupware bulletin-board mailing-list wiki instant-messaging smtp pop3

Papercut - Papercut Simple Desktop SMTP Server

•    Javascript

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Ever need to test emails from an application or web site but don't want them accidently being sent or having to deal with the hassle of setting up a test email server? Papercut is a quick email viewer with a built-in SMTP server designed to only receive messages. It doesn't enforce any restrictions how you send your email. It allows you to view the whole email-chilada: body, html, headers, attachment down to the naughty raw bits. It can be set to run on startup and sits quietly minimized in the tray giving you a balloon popup when a new message arrives.Download Papercut.Setup.exe installer.

papercut smtp-server smtp testing server

PHPMailer – A full-featured email creation and transfer class for PHP

•    PHP

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PHPMailer is a full-featured email creation and transfer class for PHP. Many PHP developers need to send email from their code. The only PHP function that supports this directly is mail(). However, it does not provide any assistance for making use of popular features such as encryption, authentication, HTML messages, and attachments. PHPMailer's integrated SMTP client allows email sending on all platforms without needing a local mail server.

smtp php-library email xoauth2 tls-support phpmailer attachment mail-client mail-library php-mail-client

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

•    Javascript

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MailDev is a simple way to test your project's generated emails during development with an easy to use web interface that runs on your machine built on top of Node.js. If you want to use MailDev with Docker, you can use the djfarrelly/maildev image on Docker Hub. For a guide for usage with Docker, checkout the docs.

maildev smtp nodemailer docker smtp-server mailcatcher testing development developer-tools email e-mail mail

Mailu - Mail server as a set of Docker images

•    Python

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Mailu is a simple yet full-featured mail server as a set of Docker images. The project aims at providing people with an easily setup, easily maintained and full-featured mail server while not shipping proprietary software nor unrelated features often found in popular groupware.

docker email imap pop3 webmail mailserver mail smtp docker-compose dkim dmarc fetchmail letsencrypt email-server mail-server self-hosted ldap