post office protocol

In the OSI model of the computer network, the TCP port completes the function specified by the fourth layer of the transport layer. Many of the applications of our computers to the network are implemented via TCP ports. This article shares the

DHCP udp67/68DNS udp/tcp53Telnet TCP23HTTP TCP80HTTPS tcp/udp443Samba udp137/138 TCP139 TCP 445FTP TCP20/21SSH TCP22Note:The following ports are commonly used by proxy servers:(1). HTTP protocol Proxy Server common port number: 80/8080/3128/8081/9080

Comprehensive technical Questions Write more than 15 commonly used Linux commands and functions that you know. No answer at this stage Have you used the VIM editor? If you use features, how to slice multiple visual windows in Vim, including

POP protocol introduction(Author: Chen Junqing October 18, 2000)This article briefly describes the principles of receiving and MIME mail through POP3 protocol, provides two Practical PHP classes for receiving and MIME decoding, and provides samples

1. IntroductionFor small nodes on the network, it is impractical to support the message Transmission System (MTS).. For example, a workstation may not have sufficient resources to allow the SMTP server and a considerable number of local email

Introduction to the POP protocol This paper briefly describes the principle of receiving the decoding of mail and MIME messages through the POP3 protocol, and provides two useful PHP classes for collecting and mime decoding, and provides examples of

POP3 Introduction to the POP protocol (Author: Chen Junqing October 18, 2000 11:53) This paper briefly describes the principle of receiving the decoding of mail and MIME messages through the POP3 protocol, and provides two useful PHP classes for

Introduction: This is a detailed page for collecting POP3 mails using PHP (1). It introduces PHP, related knowledge, skills, experience, and some PHP source code. Class = 'pingjiaf' frameborder = '0' src = 'HTTP: // biancheng.dnbc?info/pingjia.php?

What is TCP/IP? TCP/IP is a communication protocol for computers connected to the Internet. TCP/IP refers to the Transmission Control Protocol/Internet Protocol (TRansmissionCOntrolPRotocol/INternetPRotocol ). TCP/IP defines how electronic devices

Chapter 6 data communication and computer network (Data communication, data transmission rate, bandwidth, modulation mode, etc. in the channel, mainly about computer networks) 1. What is a computer network? Simply put, a computer network is a

I. Preface Database mail is an enterprise solution that sends emails through Microsoft SQL Server 2005 database engine. For example, when I was sleeping at home, I also wanted to pay close attention to my company database, so my laptop was at risk

This article introduces JSP and javamail. As more and more Java Web applications need to integrate the email function, the javamail component perfectly solves this problem. How email works The email process follows the customer-server mode. Each

N JavaMail you'll find APIs and provider implementations allowing you to develop fully functional email client applications. "Email client applications" invokes thoughts of Microsoft Outlook; and, yes, you cocould write your own Outlook replacement.

How E-mail Works   Every day the citizens of the Internet send each other billions of e-mail messages. if you are online a lot, you yourself may send a dozen or two e-mails each day without even thinking about it. obviusly, e-mail has

Applicable to: Microsoft Office Forms Server 2007, SharePoint Server 2007 To use Microsoft Office SharePoint Server 2007, Microsoft Office SharePoint Server 2007 for Search, or Microsoft Office Forms Server 2007, you must:

The examples in the previous topic are based on the HTTP protocol at the application layer. Now we will introduce the transport layer protocol-TCP protocol, this article mainly introduces the working process of TCP protocol and a simple

In network technology, port has two meanings: one is physical port, for example, ADSL modem, Hub, switch, router is used to connect other network equipment interface, such as RJ-45 port, SC port and so on. The second is the logical port, which

LVS cluster architecture This article mainly introduces the architecture of the LVS cluster. Firstly, the general architecture of the LVS cluster is given, and the design principles and corresponding features are discussed. Finally, the LVS cluster

Introduction:   The content in this blog may be a bit obscure, and the description of BlogBoy is not comprehensive enough (in fact, this requires readers to constantly explore and investigate ). However, BlogBoy still believes that it is absolutely

Port: 0 Service: Reserved Description: it is usually used to analyze the operating system. This method works because "0" is an invalid port in some systems and will produce different results when you try to connect to it using a normally closed port.