Free mta independent smtp server software for linux

DeniX Server OS is an independent Linux based distribution built from scratch by Denis Salmanovich. They aim to offer a user-friendly full-featured server operating system, pre-configured, well structured and easy to work with, and filled with the latest stable versions of Linux apps.
Its easy to install and configure. Every package is downloaded from the authors source and compiled when installed.
Main features:
- Domain Controller
- ADSL/CABLE Router (PPPoE)
- Network Firewall
- Anti Virus Gateway
- Anti Spam Gateway
- Mail Server (local & external) + Web Mail
- Calendar Sharing Support
- Network File Server
- DHCP Server
- TFTP BOOT Server
- WINS Server
- FTP Server
- VPN Server
- DNS Server
- DDNS Server
- MySQL Server
- HTTP Apache Server
- Remote Backup Solutions
- Remote control and administration
- Print Queue Server
- Proxy Server

The inline_smtp perl script was created to allow filtering of incoming mail on a separate server that houses the mailspools without running a full blown MTA. While its possible to configure another MTA, e.g. postfix, to relay all mail to a smart host and do filtering through postfix, the queue can get behind easily, and on a busy host thousands of messages can get queued in a few hours causing delays in delivery from a few minutes to several hours. Because its filtering while redirecting, mail arrives as fast as if it were coming directly to the final mail server because its relayed as the message is received.

inline_smtp works by accepting connections and relaying the conversation to the maildrop host as it takes place, so any 550 messages pass through instantly instead of getting the 550 on the relay server then having to process a bounce, which also fills the queue. inline_smtp understands enough of the smtp protocol to filter on rctp to: addresses and to process the mail body, optionally running it through a filter.

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

Mail::Bulkmail::Server is a Perl module that handles server connections and communication for Mail::Bulkmail.

SYNOPSIS

my $server = Mail::Bulkmail::Server->new(
Smtp => your.smtp.com,
Port => 25
) || die Mail::Bulkmail::Server->error();

#connect to the SMTP relay
$server->connect || die $server->error();

#talk to the server
my $response = $server->talk_and_respond("RSET");

Mail::Bulkmail::Server now handles server connections. Mail::Bulkmail 1.x and 2.x had all the server functionality built into the module itself. That was nice in terms of simplicity - one module, one connection, one server, and so on. But it had some downsides. For one thing, it only allowed for one connection. And since I wanted to allow multiple server connections in 3.00, that had to go. For another, it was a pain in the butt to change the server implementation. This way, you can easily write your own server class, drop it in here, and be off to the races.

For example, the Mail::Bulkmail::DummyServer module for debugging purposes.
This is not a module that youll really need to access directly, since it is accessed internally by Mail::Bulkmail when it is needed. Specify the data you need in the conf file and the server_file attribute, and you wont ever need to touch this directly.

Mail::Sendmail is a simple platform independent mailer.
SYNOPSIS
use Mail::Sendmail;
%mail = ( To => you@there.com,
From => me@here.com,
Message => "This is a very short message"
);
sendmail(%mail) or die $Mail::Sendmail::error;
print "OK. Log says:n", $Mail::Sendmail::log;
Simple platform independent e-mail from your perl script. Only requires Perl 5 and a network connection.
Mail::Sendmail contains mainly &sendmail, which takes a hash with the message to send and sends it. It is intended to be very easy to setup and use.
Main features:
- Automatic time zone detection, Date: header, MIME quoted-printable encoding (if MIME::QuotedPrint installed), all of which can be overridden.
- Bcc: and Cc: support.
- Allows real names in From:, To: and Cc: fields
- Doesnt send an X-Mailer: header (unless you do), and allows you to send any header(s) you want.
- Configurable retries and use of alternate servers if your mail server is down
- Good plain text error reporting
Version restrictions:
- Headers are not encoded, even if they have accented characters.
- No suport for the SMTP AUTH extension.
- Since the whole message is in memory, its not suitable for sending very big attached files.
- The SMTP server has to be set manually in Sendmail.pm or in your script, unless you have a mail server on localhost.
- Doesnt work on OpenVMS, I was told. Cannot test this myself.