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The technique of port knocking uses a series of port connections (knocks) from a client computer to enable a server connection. Examples. An example of the use of ports is the delivery of email. A server used for sending and receiving email generally needs two services. The first service is used to transport email to and from other servers.
Push email. Push email is an email system that provides an always-on capability, in which when new email arrives at the mail delivery agent (MDA) (commonly called mail server), it is immediately, actively transferred ( pushed) by the MDA to the mail user agent (MUA), also called the email client, so that the end-user can see incoming email ...
Sieve is a programming language that can be used for email filtering. It owes its creation to the CMU Cyrus Project, creators of Cyrus IMAP server . The language is not tied to any particular operating system or mail architecture. It requires the use of RFC-2822–compliant messages, but otherwise generalizes to other systems that meet these ...
Mail-in-a-Box. Mail-in-a-Box is a free and open-source program for mail server hosting developed by Joshua Tauberer. [1] [2] The software's goal is to enable any user to turn a cloud system into a mail server in few hours. [3] The tool enables developers to host mail for multiple users and multiple domain names. [4] [5]
Dovecot is an open-source IMAP and POP3 server for Unix-like operating systems, written primarily with security in mind. [3] Timo Sirainen originated Dovecot and first released it in July 2002. Dovecot developers primarily aim to produce a lightweight, fast and easy-to-set-up open-source email server . The primary purpose of Dovecot is to act ...
MailEnable. MailEnable is a Windows -based, commercial email server [1] distributed by MailEnable Pty. Ltd, an Australian-based software company which was established in 2002. [2] MailEnable's features include support for IMAP, POP3 and SMTP email protocols with SSL/TLS support, list server, [3] anti-virus and anti-spam and webmail ...
Received: when an SMTP server accepts a message it inserts this trace record at the top of the header (last to first). Return-Path: when the delivery SMTP server makes the final delivery of a message, it inserts this field at the top of the header. A mail user agent (MUA) knows the outgoing mail SMTP server from its
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