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!

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

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.

Putmail is a very lightweight MTA or SMTP client that may replace the sendmail command when used by MUAs that lack SMTP support.

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.

SMTP4PHP is a collection of PHP classes, dedicated for composing and sending multipart/mixed email messages quickly and easily, with or without embedded images and/or attachments.

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.

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.

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

Download your Yahoo Mail messages to you local inbox!

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

hotwayd/hotsmtpd are POP3/SMTP-HTTPMail gateway daemons. The HTTPMail protocol is used by the mail servers Hotmail, Lycos, Spray and MSN. The hotway suite you can receive and send mail via these services using any POP3/SMTP compliant mail reader.

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 OpenPEC project is a collaborative effort to develop an Open Source Certified E-Mail System (in italian: Posta Elettronica Certificata or PEC) as requided by the Italian law. See the DigitPA (CNIPA) site for details (http://www.cnipa.gov.it)

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.

Antispam, antivirus, authenticating SMTP daemon. Integrates with qmail, sendmail, stunnel, etc. It's simple Perl, so you can hack it to suit your needs. Supports RBLs, mx on from, bounce evil phrases, virus scanning...

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.

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.