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EMAILSERVERS | EMAIL SERVICES
| EMAIL SERVERS | MailExchange Server
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EMAILSERVERS
A mail transfer agent
or MTA (also called a mail transport agent, message transfer agent, mail
server, or a mail exchanger 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.
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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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 the most popular mail server software are
Sendmail, Postfix, Microsoft Exchange Server, Exim, Kerio MailServer,
IMail (by Ipswitch, Inc.) and qmail. Many organizations use the
services of e-mail security services such as Postini, MXLogic or
Concentric Hosting to receive e-mail.
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EMAILSERVERS | EMAIL SERVICES
| EMAIL SERVERS | MailExchange Server
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