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The Simple Mail Transfer Protocol ( SMTP) is an Internet standard communication protocol for electronic mail transmission. Mail servers and other message transfer agents use SMTP to send and receive mail messages. User-level email clients typically use SMTP only for sending messages to a mail server for relaying, and typically submit outgoing ...
The comparison of mail servers covers mail transfer agents (MTAs), mail delivery agents, and other computer software that provide e-mail services. Unix -based mail servers are built using a number of components because a Unix-style environment is, by default, a toolbox [1] operating system. A stock Unix-like server already has internal mail ...
The United States Department of Health and Human Services ( HHS) is a cabinet-level executive branch department of the U.S. federal government created to protect the health of the U.S. people and providing essential human services. Its motto is "Improving the health, safety, and well-being of America". [3]
e. In computing, the Internet Message Access Protocol ( IMAP) is an Internet standard protocol used by email clients to retrieve email messages from a mail server over a TCP/IP connection. [1] IMAP is defined by RFC 9051 . IMAP was designed with the goal of permitting complete management of an email box by multiple email clients, therefore ...
v. t. e. In computing, the Post Office Protocol ( POP) is an application-layer Internet standard protocol used by e-mail clients to retrieve e-mail from a mail server. [1] Today, POP version 3 ( POP3) is the most commonly used version. Together with IMAP, it is one of the most common protocols for email retrieval.
Logical access controls enforce access control measures for systems, programs, processes, and information. The controls can be embedded within operating systems, applications, add-on security packages, or database and telecommunication management systems. The line between logical access and physical access can be blurred when physical access is ...
Access control matrix. In computer science, an access control matrix or access matrix is an abstract, formal security model of protection state in computer systems, that characterizes the rights of each subject with respect to every object in the system. It was first introduced by Butler W. Lampson in 1971. [1]
Access control decisions are made by comparing the credentials to an access control list. This look-up can be done by a host or server, by an access control panel, or by a reader. The development of access control systems has observed a steady push of the look-up out from a central host to the edge of the system, or the reader.