Free smtp mail software for linux

msmtp project is an SMTP client.
In the default mode, msmtp transmits a mail to an SMTP server (for example at a free mail provider) which does the delivery.
To use this program with your mail user agent (MUA), create a configuration file with your mail account(s) and tell your MUA to call msmtp instead of /usr/sbin/sendmail.
msmtpqueue is a pair of very simple shell scripts that allows you to "queue" mails and send them all at a later time (useful for dialup connections: write your mails offline and send them when you are online).
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
msmtp is released under the GPL with the additional exemption that compiling, linking, and/or using OpenSSL is allowed.
Main features:
- Authentication methods PLAIN, LOGIN and CRAM-MD5 (and GSSAPI, DIGEST-MD5 and NTLM when compiled with GNU SASL support)
- TLS encrypted connections (including server certificate verification and the possibility to send a client certificate)
- DSN (Delivery Status Notification) support
- RMQS (Remote Message Queue Starting) support (ETRN keyword)
- PIPELINING support for increased transmission speed
- IPv6 support
- support for multiple accounts
- sendmail compatible interface (command line options and exit codes)

CsWebmail is yet another Web mail application. The project features support for IMAP, NNTP, and SMTP, procmail, rich text mail composing, backup abilities, a Clam AntiVirus wrapper, and an intuitive GUI.
Enhancements:
- A number of critical bugs were fixed.

libsmtp allows programs to send mail directly through SMTP (no sendmail needed). lib smtp is designed to be simple and memory efficient, and has slightly untested support for MIME multipart body parts.

SharpWebMail is an ASP.NET webmail application that is written in C#. It uses a POP3 or IMAP servers as the mailstore and sends mail through a SMTP server. It is very simple to configure (only a few settings in the web.config file). This application has all the features of a normal webclient for mail. You can compose HTML messages, search your inbox, read mime messages, have multiple address books and more.
Main features:
- Very simple to configure (only a few settings in web.config).
- Multiple POP3 and IMAP servers can be configured to read mail from. The selection of the server is based in login (username) information or (optionally) by the user.
- Tries to minimize the queries to the server caching message info (only headers).
- Authentication is handled by your email server (no additional databases needed).
- Sends mail through a SMTP server (chosen from the login information of your users). Including support for SMTP AUTH.
- HTML editor (FCKeditor) for composing mails.
- Download and send multiple attachments per message (requires write permissions in a temporary folder).
- It is possible to attach a file that we have received in other message without downloading it (with the obvious save in bandwidth and time).
- Reads MIME messages (provided by SharpMimeTools, project born because I needed an open source mime decoder).
- (Optional) Multiple Address books based on fully configurable datasources (ldap, oledb, odbc, ...). It can be read-only or read/write (with import/export capabilities).
- Is possible to sort the inbox elements by number, sender, subject, date and size (ascending and descending) .
- Search the inbox by subject and sender.
- Multilingual user interface
- XP look & feel.
- Tested with IE6 and Mozilla FireFox (1.0.7), but it should work with other versions.
- Simple sanitization of html content.

DGS SMTP is a PHP class which acts as an email client, able to send an email without using PHPs built in mail() function.

This is most often useful for sites that are unable to get PHPs build in mail() function to work. (Usually because they dont have access to sites php.ini file).

Enhancements: Compatible with TB 1.5.0.*

Requirements: Thunderbird 1.0 - 1.5.0.* ALL

XCmail is a MIME and multi POP3 server capable mailtool for X11 using the Xclasses layout library. XCmail was designed completely object orientated and by this may be improved easily.
The main purpose of XCmail is to read and write mails which may have any kind of data added (attached). For this XCmail can handle MIME types and has so called "helpers" to show different types. And XCmail offers "encoders" which encode and decode binary data into ASCII to allow the transport as mail over the Internet.
The GUI (graphical user interface) was designed to be mostly self explaining but of course there may be some things which are not explaining them self like settings or standard names that are unknown to first users.
The GUI was designed to be as simple as it can be and self explaining. Though, there are a few buttons which are not so easy to understand fo first users because are not standard.
XCmail also offers "encoders" which encode and decode binary data into ASCII to allow the transport via mail over the Internet.
The program works with a local mailbox (eg. /var/spool/mail) and multiple POP3 servers. With POP3 XCmail uses the faster UIDL function of POP3 servers (may be disabled if servers dont support this) and has a so called "UIDL history": If you get mails from your POP3 server but dont want to remove them there and later remove them only locally other mailers will read this mails again. Not XCmail! The UIDL history keeps a history of the mails read from the server so it wont read them again.
XCmail supports multiple mailboxes, has an address book for your favority email addresses and XCmail may start external programs to encode mails or handle MIME types.
XCmail also supportes PGP within PGP MIME (RFC 2015)!
Main features:
- allows the user to add multiple parts on one mail, eg. send files together with a text (called attachment)
- get mails from multiple remote mail servers
- send mails to a remote mail server using simple message transfer protokol (SMTP)
- authenticate on SMTP servers - is sometimes required on SMTP servers to stop spammers from relaying
- authenticate at POP3 server before sending mails via SMTP - this is required by some mail servers if they dont offer SMTP AUTH
- encrypt mails so unwanted persons can not read them
- encrypt complete MIME mails - including the attachments. This is a standard specified in RFC 2015
- send a nice and small picture of yourself with any mail - this is shown if the mail is read
- speedup for POP3
- this avoids XCmail from reading the same mails multiple times from the mail server
- to send files (eg. binaries) with a mail they must be encoded - XCmail offers various encoders, from standard uuencode and base64 to Mac HQX
- because not all attached files are programs XCmail offers an open interface to handle those data - eg. open an external viewer for pictures
- with plugins XCmail may be tuned - eg. some encoders and helpers are plugins so they may not be installed if a users doesnt need them - this required less space on disk and memory
- ever send a mail and later seen that it had some words misspelled? With ISpell this is no longer a problem. ISpell offers checks in many langauges!
- Put extra headers in every mail you send, eg some more information on you or some extra settings for mail agents
- put your favorite recipients in XCmails addressbook
- keeps an second internal addressbook for faster choosing an email recipient
- searches your addressbooks for a matching name or address during you type the recipient
- group different folder to one visible vfolder - for better overview
- Dont understand the language of a mail? XCmail may translate it for you by using altavistas babelfish service!
- You want to archiv many or every mail? This takes a lot of disk space?! Use XCmails folder archiv which compresses archived folders using GZIP standard
- sort or remove your mails before you "must" read them
- put are your favorite addresses in the addressbook
- dont know how to translate a word? use the dictionarys in the Web within the XCmail GUI
- using Spam Bouncer as spam filter plugin
- delete selected mails from your POP3 server
- big mails can be transfered explicitely from your POP3 server
- vCards can be read and a personal or official (from your job) vCard can be sent with every mail (you may choose which of them)
- mails of the incoming folder may be moved to a received folder automatically by many options (after reading, replying, forwarding a mail or if it is some days old)
- helps first time users to setup XCmail