Free smtp. software for linux

With SMAN you can access your POP3 account and send all your mails.
SMAN is a TCL mail manager for X11, compatible with TCL 7.5 and Wishx 4.1.
Main features:
- Recieve mail from a POP3 server
- Send mail by an SMTP server
- MIME attachments
- Address book
- TO, CC, BCC lists
- Draft messages
- Sent mails

LHMail is an email library written in Qt able to send messages over SMTP protocol and receive via POP3, suitable for implementing email clients.
Main features:
- SMTP support
- POP3 support
- Widget for displaying message contents (screenshot)
- Attachements
- HTML messages (screenshot)
- Email forwarding
- Launching user-defined external applications
- Email adresses validation
- S/MIME signatures
Enhancements:
- New features include the ability to sign messages with S/MIME signature, verification of S/MIME signatures, and PEM format key and certificate support.

SMTPGuard is a tool which controls the flow of email traversing an MTA (Mail Transfer Agent). It is designed to be used on an SMTP server for incoming mail, and currently supports postfix.
SMTPGuard was originally created to meet the needs of Internet Service Providers (ISPs). ISPs typically receive tremendous amounts of email from their local (user) network.
Within a wide variety of users, some are spammers, many unknowingly have virus infected PCs; each of these can send large quantities of mail through the ISPs SMTP (Simple Mail Transfer Protocol) servers.
This is especially a problem for ISPs who are connected to their users via high speed lines such as fiber or ADSL. SMTPGuard was developed to prevent SMTP servers from being overwhelmed by unexpected spikes in usage from specific (often malicious) users.
For a large ISP, their only problem isnt just with overloaded incoming SMTP servers. SPAM will also be queued on the outgoing server (perhaps the same server) for delivery to the Internet.
Because the mail is SPAM it will likely bounce, then double bounce putting extreme load on the outgoing server and its queue. smtpguard is designed to stop this type of extreme load by stopping floods of mail at the gate (incoming server).
SMTPGuard is point based. Each time a client connects to the SMTP server, SMTPGuard adds points according to the rules file. SMTPGuard uses information acquired during the SMTP session, adds points according to the rules file, and finally takes actions based on its settings. For example, the information below is used:
- Remote IP Address
- Character string provided by MAIL FROM command
- Character string provided by RCPT TO command
The following actions can be taken:
ok - white list
wait - delay processing
reject - reject messages
mail - send alert email to administrator
log - output message to log
delete - delete record in database
Enhancements:
- postfix/flexguard.c: remove word flexguard. use smtpguard instead. rename filename to postfix/smtpguard.c
- postfix/Makefile.am: rename flexguard -> smtpguard
- configure.in: 1.1.1
- rename FLEXGUARD_{CFLAGS,LIBS} -> SMTPGUARD_{CFLAGS,LIBS}
- smtpguard/Makefile.am,postfix/Makefile.am,test/Makefile.am: Ditto
- debian/postfix-smtpguard.files: added
- README.postfix: added

Dwarf Mail Server is a full-featured mail server developed on the Java platform, implementing SMTP, POP3 and IMAP4rev1 protocols.
Dwarf Mail Server provides support for rich application message processing via pluggable mail filters and agents, as well as full handling of virtual domains for the SMTP/POP3/IMAP4 protocols, and is free of charge for the binary redistribution.
Since the server is based on the Dwarf framework, it also shares its common design principles and features - simplicity, high modularity and extensibility, authentication and authorization, XML-based configuration, logging and remote management.
Main features:
- ESMTP, POP3 and IMAP4rev1 implementation
- application logic layer provided by mail filters and agents
- virtual mail hosts in SMTP/POP3/IMAP4 server
- application-independent authentication and authorization
- sample JSP-based webmail interface
Dwarf Mail Server is targeted for both end users who are just looking for simple, secure and robust mail server as well as developers who need an extensible and powerful framework for application message processing.
For users with minimal requirements it can offer portability, simple configuration as well as strong security.
- Portability: several OS platforms are supported via the Java technology, including MS Windows, UNIX/Linux/BSD, MacOS X and others.
- Configuration: just 3 lines have to be changed to fire up a sample mail server and a few of them to run a full featured SMTP/POP3/IMAP4 server.
- Security: it uses Java Platform Security Architecture in combination with Java Authentication and Authorization Service (JAAS), as well as SSL/TLS for the secure communication.
Advanced or enterprise users can additionally appreciate performance scalability, multiple domain handling, enhanced security features and modular design easing to incorporate it to the existing infrastructure.
- Scalability: gaining from multithreaded design and dynamically adjustable allocation of resources.
- Multiple domains: server is able to handle multiple virtual domains in a single instance for all SMTP, POP and IMAP protocols.
- Enhanced security: includes subject-based permissions and access control lists for IMAP, SMTP relaying control rules, host-based filtering, SSL/TLS communication, basic anti-spam filtering, etc.
- Robustness: client/server network communication is by design separated from the resource-expensive application logic layer. The server implementation is based on the unparsed byte streams whenever possible, including its own and highly efficient MIME parser.
Dwarf Mail Server also appears to be a suitable platform for application development and customization. Its modular structure and lightweight API allows enhancing existing functionality or completely exchanging the certain part as a whole:
- Message processing: mail filters and agents provide an unique infrastructure for rich message processing.
- Mail queue: physical mail queue representation is abstracted by the API specification and may replaced by a custom implementation.
- Storage subsystem: physical data representation (i.e. messages, folders, configuration options, ACLs) is abstracted by API and may be replaced by a custom implementation based on filesystem, SQL database, etc.
- MIME parser: the parsing engine may be reimplemented for the top efficiency according to the currently used mail storage.
Dwarf Mail Sever has been tested with the most popular mail clients like MS Outlook, Mozilla, Thunderbird, Opera, Apple Mail, Becky!, Pegasus, Eudora, Pine, The Bat! and others.
Other features:
- multi-threaded server
- dynamically adjusted number of active threads
- server API for mail, user data and ACL storages
- robust SMTP server architecture with flexible queue design
- simultaneous deliveries to remote SMTP hosts
- transparent Delivery System Notification (DSN) mechanism
- support for shared mail folders
- fast and universal stream-oriented MIME parser
- runtime server configuration
- built-in SSL/TLS support
- full documentation with user guides and tutorials
- samples with source code

libESMTP is an SMTP client which manages posting (or submission of) electronic mail via a preconfigured Mail Transport Agent (MTA).
libESMTP library may be used as part of a Mail User Agent (MUA) or other program that must be able to post electronic mail but where mail functionality is not that programs primary purpose.
The availability of a reliable lightweight thread-safe SMTP client eases the task of coding for software authors thus improving the quality of the resulting code.
Main features:
- libESMTP supports many SMTP extensions, notably PIPELINING (RFC 2920), DSN (RFC 1891) and SASL authentication (RFC 2554). SMTP AUTH is implemented using a SASL client library integrated into libESMTP. Supported SASL mechanisms include CRAM-MD5 and NTLM.
- libESMTP is also efficient. Because it buffers all network traffic, when used in conjunction with a pipelining SMTP server libESMTP significantly increases network performance, especially on slow connections and those with high latency. Even without a pipelining server libESMTP offers significantly better performance than would be expected with a simple client.
- libESMTP is not designed to be used as part of a program that implements a Mail Transport Agent. This is not because the code is unsuitable for use in an MTA, in fact the protocol engine is significantly better than those in many MTAs. Rather, by eliminating the need for MX lookup and next-hop determination, the design of libESMTP is simplified; thus goals are made achievable. Besides, such features are undesirable in a program that is not an MTA, particularly if the client is behind a firewall which blocks access to port 25 on the Internet.
Enhancements:
- This release applies bugfixes and plugs some memory leaks.
- It also attends to a few autoconf-related issues.

ClamSMTP project is an SMTP filter that allows you to check for viruses using the ClamAV anti-virus software.
It accepts SMTP connections and forwards the SMTP commands and responses to another SMTP server. The DATA email body is intercepted and scanned before forwarding.
ClamSMTP aims to be lightweight, reliable, and simple rather than have a myriad of options. Its written in C without major dependencies. If you need more options then you could use something big like AMaViS which is written in PERL and can do almost anything.
I wrote this with the Postfix mail server in mind. Heres how to configure it as a Postfix Content Filter.
ClamSMTP can also be used as a transparent proxy to filter an entire networks SMTP traffic at the router.
Enhancements:
- Support has been removed for listening on ports under 1024.
- Support has been added for embedded NULLs in email data.
- Problems with not listening properly when in daemon mode have been fixed, as well as warnings when compiled with gcc 4.0.
- Empty addresses are handled properly in logs.
- This release will not let Exchange send its strange binary data through the proxy.
- More Solaris fixes.
- Email messages are not rejected when the server is overloaded or encounters errors, or when starting the filter command fails.

mysqmail-qmail-logger is a very small daemon that logs SMTP traffic such as successful delivery and relaying to an SQL database.
mysqmail-qmail-logger peoject splits the information by domain and by users in both the to and from fields, which makes it very easy to count all the SMTP traffic for a given domain name.
Enhancements:
- This version adds the management of a score board table for each domains, so monitoring of qmail traffic is made in real time.