556 Open source projects that are alternatives of or similar to Core

MailTrap has been renamed to Sendria. Please use Sendria now, MailTrap is abandoned. MailTrap is a SMTP server designed to run in your dev/test environment, that is designed to catch any email you or your application is sending, and display it in a web interface instead of sending to real world.

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.

Yii 2 swiftmailer extension.

Sieve Script Editor

基于 Net.Mail 封装的发送邮件工具类。仅需一行代码，发送邮件。支持自定义邮件发出邮箱、发出方名字等。 支持SSL加密发送。 多个接收人、抄送人。支持群发独显。 支持添加附件、多个附件。 目前大部分主流邮箱全支持。

This library integrates Postal with the standard Laravel mail framework.

Postfwd plugin for blocking international spam botnets based on geographical location of IP addresses used to login to postfix via sasl.

Recursively copy all e-mail messages and folders from one IMAP account to another.

📩🛡 Email privacy. Anonymously send and receive with alias forwarding.

🐝 experimental terminal mail client, mirror of https://git.meli.delivery/meli/meli.git https://crates.io/crates/meli

The one and only django app to receive & send mail with templates and multiple configurations.

A graphical threads-with-tags style, lightweight and fast, e-mail client for Notmuch

Official Node.js library for the Postmark API

A Gatsby email *application*

💌 A beautiful, fast and fully open source mail client for Mac, Windows and Linux.

DKIM (DomainKeys Identified Mail) Key

A simple (but correct) library for validating email addresses. Supports mail addresses as defined in rfc5322 as well as the new Internationalized Mail Address standards (rfc653x). Based on https://github.com/jstedfast/EmailValidation

MailMergeLib is a mail message client library which provides comfortable mail merge capabilities for text, inline images and attachments, as well as good throughput and fault tolerance for sending mail messages.

Mail4Delphi uses the Indy component to send the email.

The best free email forwarding for custom domains. Visit our website to get started (SMTP server)

IP-Biter: The Hacker-friendly E-Mail (but not only) Tracking Framework

MIME mail encoding and decoding package for Go

An automated e-mail OSINT tool

isBizMail tells you whether a given email address belongs to a free email account provider (gmail.com, yahoo.es, yandex.ru etc) or not.

Command-line interface for email management

Send emails using Django template system

Laravel MJML offers support for rendering MJML syntax into in-line HTML that can be sent within mails.

A lightweight SMTP mail library

MFCMAPI

⚙️ A GitHub Action to send an email to multiple recipients

The best free email forwarding for custom domains (Web Server)

Insular email distribution - mail server as Docker images

Ido is a clean, simple, Polymail-inspired theme for Mailspring

A lightweight PHP SMTP mail sender

A fully tested email parser for PHP 7.2+ (mailparse extension wrapper).

Golang package for send email. Support keep alive connection, TLS and SSL. Easy for bulk SMTP.

Sendria (formerly MailTrap) is a SMTP server designed to run in your dev/test environment, that is designed to catch any email you or your application is sending, and display it in a web interface instead of sending to real world.

⚡️Arduino Mail Client Library to send, read and get incoming mail notification for ESP32, ESP8266 and SAMD21 devices. The library also supported other Arduino devices using Clients interfaces e.g. WiFiClient, EthernetClient, and GSMClient.

The official PHP library for Postmark.

Adds email sending capability to a Nuxt.js app. Adds a server route, an injected variable, and uses nodemailer to send emails.

An unofficial desktop client for ProtonMail done with electron nativefier

A cross-platform IMAP library for .NET, supporting .Net 2.0 - 4.5, Mono and Windows Phone

mailcow: dockerized - 🐮 + 🐋 = 💕

Self-hosted server for the ProtonMail client

Easily send great-looking HTML email messages from R

Common packages for Go

The Official Twilio SendGrid Led, Community Driven Java API Library

Jodd! Lightweight. Java. Zero dependencies. Use what you like.

Exchange Transport rules to detect and enable response to phishing

Full-featured, open source mail server solution for mainstream Linux/BSD distributions.

The Official Twilio SendGrid Led, Community Driven Ruby API Library

Check if an email address exists without sending any email, written in Rust.

HEML is an open source markup language for building responsive email.

Simple, modern & fast web-based email client

🦘 The Grouparoo Monorepo - open source customer data sync framework

Virtual Mailbox Administration

The best (weekly) newsletters

Build composable mail messages

Emails at the heart of your business logic!

A few simple, but solid patterns for responsive HTML email templates and newsletters. Even in Outlook and Gmail.