Information about Mail Exchange Server
A mail transfer agent or MTA (also called a mail transport agent, message transfer agent, mail server, SMTPD (short for SMTP daemon), or a mail exchanger (MX) in the context of the Domain Name System) is a computer program or software agent that transfers electronic mail messages from one computer to another.
It receives messages from another MTA (relaying), a mail submission agent (MSA) that itself got the mail from a mail user agent (MUA), or directly from an MUA, thus acting as an MSA itself. The MTA works behind the scenes, while the user usually interacts with the MUA.
The delivery of e-mail to a user's mailbox typically takes place via a mail delivery agent (MDA); many MTAs have basic MDA functionality built in, but a dedicated MDA like procmail can provide more sophistication.
According to various surveys [1] [2] [3] [4] the most popular mail server software are sendmail, Postfix, Microsoft Exchange Server, Exim, IMail (by Ipswitch, Inc.), MDaemon by Alt-N Technologies, MailEnable, Merak Mail Server and qmail. [5] The MailChannels survey<ref name="oreilly" /> also found that many organizations use the services of e-mail security services such as Postini, MXLogic or Concentric Hosting to receive e-mail.
It receives messages from another MTA (relaying), a mail submission agent (MSA) that itself got the mail from a mail user agent (MUA), or directly from an MUA, thus acting as an MSA itself. The MTA works behind the scenes, while the user usually interacts with the MUA.
The delivery of e-mail to a user's mailbox typically takes place via a mail delivery agent (MDA); many MTAs have basic MDA functionality built in, but a dedicated MDA like procmail can provide more sophistication.
According to various surveys [1] [2] [3] [4] the most popular mail server software are sendmail, Postfix, Microsoft Exchange Server, Exim, IMail (by Ipswitch, Inc.), MDaemon by Alt-N Technologies, MailEnable, Merak Mail Server and qmail. [5] The MailChannels survey<ref name="oreilly" /> also found that many organizations use the services of e-mail security services such as Postini, MXLogic or Concentric Hosting to receive e-mail.
See also
Mail server surveys
1. ^ Security Space Mail (MX) Server Survey, 1st Aug 2007.
2. ^ MailChannels Mail Server Survey, 2006
3. ^ Anonymous, Open source Mail Server Comparison, November 2003
4. ^ Daniel J. Bernstein, Internet host SMTP server survey, November 2001
5. ^ Dan Shearer, MTA Comparison, January 2007
2. ^ MailChannels Mail Server Survey, 2006
3. ^ Anonymous, Open source Mail Server Comparison, November 2003
4. ^ Daniel J. Bernstein, Internet host SMTP server survey, November 2001
5. ^ Dan Shearer, MTA Comparison, January 2007
Simple Mail Transfer Protocol (SMTP) is the de facto standard for e-mail transmissions across the Internet. Formally SMTP is defined in RFC 821 (STD 10) as amended by RFC 1123 (STD 3) chapter 5. The protocol used today is also known as ESMTP and defined in RFC 2821.
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daemon (IPA pronunciation: /'dimən/ or /'deɪmən/[1]
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On the Internet, the Domain Name System (DNS) associates various sorts of information with so-called domain names; most importantly, it serves as the "phone book" for the Internet by translating human-readable computer hostnames, e.g. en.wikipedia.
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A computer program is one or more instructions that are intended for execution by a computer. Specifically, it is a symbol or combination of symbols forming an algorithm that may or may not terminate, and that algorithm is written in a programming language.
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In computer science, a software agent is a piece of software that acts for a user or other program in a relationship of agency[1]. Such "action on behalf of" implies the authority to decide when (and if) action is appropriate.
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E-mail (short for electronic mail; often also abbreviated as e-mail, email or simply mail) is a store and forward method of composing, sending, storing, and receiving messages over electronic communication systems.
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A mail submission agent or MSA is a computer program or software agent which receives electronic mail messages from a mail user agent (MUA) and contacts a mail transfer agent (MTA) for delivery of the mail.
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An e-mail client is a frontend computer program used to manage e-mail. Large all-in-one e-mail clients such as the open source Mozilla Thunderbird and Microsoft Outlook today combine the operations of an MSA, MDA, MRA and MUA in one application.
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A Mail Delivery Agent (MDA) is software that accepts incoming e-mail messages and distributes them to recipients' individual mailboxes (if the destination account is on the local machine), or forwards to another SMTP server (if the destination is on a remote server).
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Procmail is a mail delivery agent (MDA) or mail filter, a program to process incoming emails on a computer, widely used on Unix systems. It is typically invoked from a mail transfer agent (MTA) like Sendmail; this makes the mail processing event-driven.
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Sendmail is a mail transfer agent (MTA) that is a well known project of the open source, free software and Unix communities, which is distributed both as free software and proprietary software.
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Postfix is a free software / open source mail transfer agent (MTA), a computer program for the routing and delivery of email. It is intended as a fast, easy-to-administer, and secure alternative to the widely-used Sendmail MTA.
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Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft. It is part of the Microsoft Servers line of server products and is widely used by enterprises using Microsoft infrastructure solutions.
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Exim is a mail transfer agent (MTA) used on Unix-like operating systems. It is freely available under the GNU GPL and it aims to be a general and flexible mailer with extensive facilities for checking incoming e-mail.
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Ipswitch, Inc. is a computer software company founded in 1991 by Roger Greene. Headquartered in Lexington, Massachusetts, United States, they have offices in Atlanta and Augusta, Georgia as well as Amsterdam, The Netherlands.
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Alt-N Technologies is a US-based software company founded in 1996 that specialises in telecommunications server software.
Their flagship software product is the MDaemon e-mail server.
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Their flagship software product is the MDaemon e-mail server.
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MailEnable is a mail server for Microsoft Windows. It is distributed as a commercial application, with Professional and Enterprise editions, and as a freeware edition which lacks some more advanced features.
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IceWarp Server is a multi-purpose e-mail, messaging and collaborative software product developed by IceWarp Software, based on Merak Mail Server- an open Internet standards compliant Mail Transfer Agent for Windows and Linux operating systems.
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qmail is a mail transfer agent that runs on Unix. It was written by Daniel J. Bernstein as a more secure replacement for the popular Sendmail program.
The author offered a US$500 reward for the first person to publish a verifiable security hole in the latest version of the
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The author offered a US$500 reward for the first person to publish a verifiable security hole in the latest version of the
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Postini, an Electronic Mail Security company, was founded in 1999 and based in San Carlos, CA. On July 9, 2007, Google announced that it had signed a definitive agreement to acquire enterprise messaging security and compliance company Postini.
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An MX record or Mail exchanger record is a type of resource record in the Domain Name System (DNS) specifying how Internet e-mail should be routed. MX records point to the servers that should receive an e-mail, and their priority relative to each other.
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This is a list of mail servers: mail transfer agents, mail delivery agents, and other computer software which provide e-mail services.
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SMTP
- Apache James
- Atmail
- AXIGEN
- Citadel
- SparkEngine
- Stalker CommuniGate Pro
- Courier
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This is a comparison of mail servers: mail transfer agents, mail delivery agents, and other computer software which provide e-mail services.
Mail server Server OS support Features Storage License
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Feature comparison
Mail server Server OS support Features Storage License
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An e-mail client is a frontend computer program used to manage e-mail. Large all-in-one e-mail clients such as the open source Mozilla Thunderbird and Microsoft Outlook today combine the operations of an MSA, MDA, MRA and MUA in one application.
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A Mail Delivery Agent (MDA) is software that accepts incoming e-mail messages and distributes them to recipients' individual mailboxes (if the destination account is on the local machine), or forwards to another SMTP server (if the destination is on a remote server).
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