Free kerio mail server software for linux

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

Clevo Mail LED Linux Driver operates the mail LED on the Clevo notebook model D4J.
Enhancements:
- The DMI_BOARD_VENDOR string has been corrected for D410V autodetection.

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

DeskNow project is a fully featured and easy to use mail and collaboration server that can handle all the communication and collaboration needs of your company.
Main features:
- fully featured mail server
- advanced antispam technologies, antivirus integration and content filtering
- dynamic webmail interface
- document management
- advanced calendaring with meeting planning, free/busy search, shared calendars, task lists, resource booking, iCal publishing (Mozilla Sunbird, Apple iCal)
- Outlook connector to integrate personal and group calendars, tasks, contacts
- SyncML synchronization with Palm, PocketPC, BlackBerry and most mobile phones
- secure Jabber instant messaging with integrated web client
- automatic authentication and account import with Active Directory and LDAP servers
Enhancements:
- This version introduces minor improvements to IMAP import and features improved SyncML duplicate detection and a maxhops configuration setting.

procmail is a mail processing and SmartList mailing list suites. Procmail can be used to create mail-servers, mailing lists, sort your incoming mail into separate folders/files (real convenient when subscribing to one or more mailing lists or for prioritising your mail), preprocess your mail, start any programs upon mail arrival (e.g. to generate different chimes on your workstation for different types of mail) or selectively forward certain incoming mail automatically to someone.
Enhancements:
- Regression bugs from 3.20:
- Broke compilation with K&R compilers
- procmail -p -m was overridding PATH
- maildir delivery included garbage in filenames
- Mismatched HOST in last rcfile didnt discard the message
- COMSAT wasnt turned off by an rcfile on the command line
- Catch overly long command line variable assignments
- If a command expansion is truncated, set PROCMAIL_OVERFLOW and dont trim trailing (really middle) newlines
- If the comsat host cant be resolved, set COMSAT to "no"

Kshowmail project is a KDE tool to watch mails on a POP3 server. Headers and complete mails can be viewed without loading them to the local mail client. Unpleasant mail can be deleted from the server.
The list of displayed mails can be refreshed via configurable timers. Filters can be assigned to mark known spam for deletion. Multiple accounts are supported.
A sound can be played if new mail arrives. A command menu allows user configurable commands like fetchmail or sendmail. A special command can be defined to send complain mail against spam.
The modifications I provided are mainly Qt/KDE stuff to generate a nice GUI interface. I am using the great development tool kDevelop V2.1.
Enhancements:
- Fixed bug where if you configure 2 accounts, retrieve mail, and then deactivate one of the accounts, its number of messages still reflects in the tray icon.
- Fixed sort of message number and size columns in message list to be numerical rather than alpha.
- Corrected version displayed in the About dialog.