Open Source Mac Mail Transfer Agents

E-MailRelay is a simple SMTP proxy and relay MTA, written in C++, for Linux and Windows. As a proxy all messages can be passed through a user-defined program, such as a spam-filter, which can drop, readdress, or edit messages as they pass through.

mailsend is a simple command line program to send mail via SMTP protocol. It can send a piece of alert mail from a program in a networked Windows machine. It's feature-filled, cross-platform, free and open source, and does not use any config file.

YPOPs! is an application which emulates a POP3/SMTP mail server and provides free POP3 and SMTP access to Yahoo! Mail. It does not depend on Yahoo's POP3/SMTP mail server. You can use a mail client of your choice!

This project builds on top of the (and adds additional) scripts included with msmtp (a command-line send only email client) in order for it to act as a queueing Mail Transport Agent (by acting as the sendmail command; it also offer an minimalist SMTP server mode) with some additional features like verify-before-send (which requires you to confirm that you really do want to send email, after a required delay (cooling off period)) for those who need to think twice about the wisdom of what they send, or who tend to notice their grammar spelling errors after the fact.

ZMail allows you to send email from anyone, to anyone. You can use ZMail to send fake or anonymous emails. Have fun!

TEK empowers low-connectivity communities by providing a full Internet experience using email as the transport mechanism.

jwSMTP, Send email programmatically (C++ code/lib). Linux, BSD, Windows etc. Attachments, Multiple recipients, Cc/Bcc recipients supported. MX lookup or send to an SMTP server direct. LOGIN and PLAIN authentication now supported. Html or plain text forma

Policy-daemon for the postfix MTA in perl. Scores RBLs, RHSBLs, HELO, Client IP and MAIL FROM argument and sums up a score on which you can reject the mail before DATA will be received. Results are cached. I.e: a weighted SMTP filter before DATA (queue).

Download your Yahoo Mail messages to you local inbox!

NMail provides an SMTP client & server along with an IMAP4 server; all are written in C#.

smtptrapd is a multi-threaded daemon written in C that provides a RFC 2821 compliant SMTP service that always returns a 4xx soft error to the RCPT TO verb. It can be deployed as a secondary MX to reduce the amount of inbound spam.

DSN Support for Exim. This patch allows Exim 4.xx to support the sending of email Delivery Status Notifications. From Exim 4.83 onwards DSN is now included as standard (based on this patch). dsn_process was a removed option of this standard inclusion and so the patches after 4.76 will re-enable that functionality and provide a binary with the same options / configurations as previously.

Hedwig is an open source IMAP, SMTP, POP3 server written in Java, designed with ease of installation and configuration in mind. Hedwig enables storage of mail message headers in a relational database(MySQL or Oracle) and mail messages in a file system. Visit http://hwmail.sourceforge.net/ for more information.

GITST Email Sender allows you to send multiple emails from multiple email accounts adding limits on each email account For example, you want to send 500 from gmail then switch to yandex and send 300 from yandex and so on that is all what it does sends unlimited emails from multiple different email accounts it is basics of anti-spam penetration system

JMultiSend is a simple and fast solution to send mass emails (Bulk E-mail); it only needs to load the list of addresses, the message (HTML or TXT), the data and then send. It is possible also to manage mailing lists subscribtions simply by emails, to send personalized messages with the user name and to schedule delays up to 24h (86400 secs); all this also from command-line. Since it is developed in Java it is a cross-platform application and does not need installation but needs only the Java Virtual Machine (version 6 or higher) that, in the case, is very easy to download and install.

A small, fast, secure, anti-spam SMTP mail server (MTA). Delivery to mbox files and Maildirs supported. qwik-smtpd supports RBL, relay checking, raw/custom message handlers, and more. Custom authentication via checkpassword and a qmail-compatible configu

Check given IP/Host presence in 106 RBLs. Now, you don\'t have to check a lot www sites, just run this script in console.

This anonymous emailer script written in PHP is a free, opensource project designed to send EMails from anyone to anyone, with additional details such as Reply-To ,an anti-spam CAPTCHA and a WYSIWYG.

Anti-Bot Form Mailer is a PHP script that helps webmasters reducing spam received via their contact or support form.

A SMTP-Proxy that allows authenticated SMTP sessions to traverse, while stopping SMTP sessions from internet worms and SPAM bots. It can also be used transparently so clients need no additional settings, just auth. to their freemail of choice.

Email2Fax and Fax2Email gateway for Asterisk, that could be integrated to your own existing Asterisk.

This is a milter which scans emails with CRM114

API similar to Java-Mail (TM). This API is to be in C# and will be available for the dotNet-aware platforms.

IMAP protocol implementation in C++

This is a PHP class to send mesages through a SMTP server, that allows user auth and send some message types, like plain text or html.