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.

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

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!

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.

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

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.

DKIM for JavaMail is a small JAR that can be easily implemented in existing Java projects using JavaMail for sending DKIM signed emails.

SMTP server, POP3 server, LDAP server, IMAP4 server, WWW administrator's interface

The goal of this project is to develop a very simple SMTP server that responds to SMTP requests and makes received messages available for query at a later time. All useful features for a SMTP server that can be used in an automated testing suite.

JavaEmailer is a Java Classes Library that allows Java developers to easily integrate a mass mailer to their applications. JavaEmailer manages file attachments, SMTP servers, CCs, BCCs, plain text and/or html messages, and more...

Exfix (Exchange forwarding fixer) allows users of Outlook Web Access who do not have IMAP enabled on their account to forward their email to another address.

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.

The Exim Ldap Mail Administrator is a webfrontend for your mailserver environment running EXIM with LDAP. It supports multiple virtual maildomains including users and aliases. Filter and vacation settings will be available soon.

The postfixadmin application rewrite with ExtJS and ADODB. I would like to create a professional and modern GUI. Backend: php5, adodb Frontend: Extjs 2.2.1

A scalable e-mail system framework. Based around an LDAP, all modules are independant, giving the administrator the right to choose their own personal favourite component. Designed to improve the migration & admin of large scale mail systems.

FetchYahoo is a Perl script that downloads mail from a Yahoo! account to a local mail spool. It downloads all parts and attachments and then deletes messages unless requested not to. It can also forward messages and repeat with a given interval.

Foedus Mail is a mail server written in Java. The goal is to produce stable IMAP, SMTP, and POP3 support and then to build upon and refine it.