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Qmail was developed in 1995, but first introduced for public and free use in 1998. Qmail is written in Unix, in the public domain and therefore free to use.

Q: When was Qmail first introduced?

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Qmail was developed in 1995, but first introduced for public and free use in 1998. Qmail is written in Unix, in the public domain and therefore free to use.

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A Web server is a program that, using the client/server model and the World Wide Web's Hypertext Transfer Protocol ( HTTP ), serves the files that form Web pages to Web users (whose computers contain HTTP clients that forward their requests). Every computer on the Internet that contains a Web site must have a Web server program. Two leading Web servers are Apache , the most widely-installed Web server, and Microsoft's Internet Information Server ( IIS ). Other Web servers include Novell's Web Server for users of its NetWare operating system and IBM's family of Lotus Domino servers, primarily for IBM's OS/390 and AS/400 customers

A mail server (also known as a mail transfer agent or MTA, a mail transport agent, a mail router or an Internet mailer) is an application that receives incoming e-mail from local users (people within the same domain) and remote senders and forwards outgoing e-mail for delivery. A computer dedicated to running such applications is also called a mail server. Microsoft Exchange, qmail, Exim and sendmail are among the more common mail server programs

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This depends on how your website is configured. If you're simply paying a monthly fee to some company (who are providing the Web server), then you'll need to ask them about e-mail services. Most companies actually provide a bunch of e-mail boxes in their default plans. If you've set up your own server, you'll need to install all sorts of e-mail programs on it. Google them up. (I'll improve this bit later...)

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Some ISP's still allow what is called Open Relay. This means that anyone who knows the mail server, may relay outgoing email off of the open mail server. A way to eliminate this is to restrict outbound mail to only valid users. This is called SMTP Authentication and it requires the user sending mail to authenticate with a username and password in order to send off that mail server. The problem is, many ISP's overseas do not implement these simple changes in their mail server configuraions. Even worse, many of these ISP's allow a home DSL/Cable subscriber to setup their own mail server at home to send spam - getting a new IP address based on the ISP's settings, which makes it harder to track down and block via blacklisting. There are many solutions that filter junk mail at the server, before it hits your in-box. Spamassassin is a popular solution for Qmail/Linux and we use it in tandem with our own proprietary systems which keeps out 99% of the spam sent to our customers. The downside is that if the sender is using a properly configured mail server and they send directly to your address (you signed up for a maling list for example), the mail won't appear as spam and will get through if it doesn't get flagged by the Spam blocker software on the mail server. This is why you see so many spams that look like a letter but are utter nonesense. They are attempting to trick the Spam blocking software by making it think it is valid correspondence. I've also noticed that some users with Thunderbird for their mail client like to use a spoof or reply-to method where the mail looks like it came from a user different than the actual sender. These are flagged as spam by our mail servers, but they still get to your in-box (with spam in the subject) because they may be valid emails. There is a fine line that network admins have to walk in order to keep out a majority of spam while still allowing your idiot friends who use Thunderbird with a different reply-to address to send you valid mail or use their hotmail account. If the settings are too strict, then valid mail gets blocked and your email becomes unrealiable. If anyone is interested, Thorne Digital in NYC offers full service hosting with 99% spam-free email accounts at thornedigital.com or feel free to call us at 646-734-8989 if you are tired of your company losing productivity to vast amounts of spam.

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Answer
Use DeepOfix; a custom distribution (based on debian) that is specialized for email delivery.

A list of features (copied and pasted from http://deeproot.in/deepofix/features)
Simplified installation systemIntegrated server management systemWe ensure that a lack of prior GNU/Linux server administration experience is not a problem at all. The EasyPush Server Manager (our server management system) simplifies day-to-day server administration and monitoring tasks. EasyPush allows a server admin to build up upon their knowledge of server administration and learn more about GNU/Linux.

Built-in LDAP supportdeepOfix is one of the first (and few) GNU/Linux operating systems that ship with built-in and pre-integrated support for LDAP. LDAP support in deepOfix goes beyond installation - in deepOfix LDAP is not just installed, but also configured as the default store for user account data and password information. LDAP support not only enables deepOfix to be highly scalable, but also ensure a large group of features that would otherwise have been impossible.

Intelligent & flexible account management
SMTP / POP3 / IMAP ServicesdeepOfix allows you to have greater control with on how your mail sending and delivery (SMTP) services work. Additionally, it provides you with out-of-the-box POP3 and IMAP services to access your mailbox.

Web-based emailPre-integrated anti-virus and anti-spam toolsdeepOfix does not require you to do anything extra to filter emails for spam or virus! The ClamAV anti-virus system ensures virus free mailboxes for users - even anti-virus signature updates are automated! The SpamAssassin-based anti-spam system ensures that you can control incoming spam. The server ships pre-configured with secure defaults that can be further optimised using our EasyPush Server Manager and best of all, our continued research and development ensures that your spam control system remains updated and capable enough to handle new and upcoming spam threats as well Centralised LDAP-based address books
Groups and Distribution ListsEmail fetch with multidrop support

Fetch email from other mail servers?
Mix catch-all, multi-drop and individual mail accounts?
Work multiple protocols to fetch email - POP3, IMAP etc?

Extensive customisation optionsGet your deepOfix server to work better for you:

Know some sort of scripting (shell or Perl etc.)? Want to write quick add-ons for deepOfix to something more? EasyPush supports simple extensions via command-line programs and scripts
Experienced programmer and want to get deepOfix to do more? Weave your own code!

Answer
FreeBSD, available for free download from http://www.freebsd.org/. FreeBSD powers a number of commercial web and mail hosting sites, including many of the servers at Yahoo! FreeBSD supports a number of popular mail servers, including sendmail, postfix, exim, and qmail, plus spam and virus filters, IMAP and POP servers for client access to mail, and any other email related utilities your heart may desire.
A tutorial on how to create a mail server running FreeBSD, sendmail, and the University of Washington POP and IMAP server is available at:
http://www.puresimplicity.net/~hemi/freebsd/sendmail.html Answer:
Any server intended operating system: NT4, 2000 Server, 2003 Server, 2008 Server, OS/X, Linux, FreeBSD, NetBSD. The hard part about servers is matching the load (amount of work), the hardware (as low cost as possible yet still accomplish the goal), and the operating system (cost, ease of administration, stability and security) against your needs now and for a specific period of time into the future: a year, 2 years, 5 years. That's what infrastructure engineers do - they optimize the use of machines against load and future use.

The best system to use is one that whomever is administering the system knows - you can have the best op system and if the admin can't use it right (not experienced with it) you might as well open your windows and doors to the world "come on in, get our data!" or go the users and say "sorry, the server will be going down all the time randomly, expect it."

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