On the Internet, sendmail is the most popular UNIX-based implementation of
the Simple Mail Transfer Protocol (SMTP) for transmitting e-mail. When a sendmail server receives
e-mail, it attempts to deliver the mail to the intended recipient immediately and, if the recipient
is not present, it queues messages for later delivery. However, because it does not provide a
mailbox facility and for other reasons, other software such as a POP3 or Internet Message Access Protocol
server are also needed. Most Internet service providers (ISPs) provide both an SMTP
server (such as sendmail) and a POP or IMAP server.
A commercial version of sendmail, called Sendmail, includes a POP3 server and other enhancements
to the basic open
source sendmail. It also comes in a version that can be installed on a Windows NT operating systems
platform.
This was last updated in July 2006
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