smtp v3

List of common error reports for Linux email servers-Linux Enterprise applications-Linux server application information. For details, refer to the following section. Server 400 Error Report Q: 421 Server too busy A: Unable to connect because the

Introduction to Nginx Introduction to common Web servers Web servers are often referred to as WWW (World Wide Web) servers, HTTP servers, and their main function is to provideOn-line information browsing services, common Web servers

This article first points out the famous open-source email systemQmailIn terms of security, the existing security tools on UNIX systems are used to solve the existing security risks of Qmail, next we introduce a Base91 encoding technology that is

RFC document directory Rfc1 host softwareRfc2 host softwareRfc3 documentation SpecificationRfc4 Network ScheduleRfc6 and Bob Kahn sessionsRfc10 documentation SpecificationRfc13 zero text length EOF InformationRfc16 M. I .tRf18imp-IMP and host-Host

A long time ago, I wanted to learn about vsftpd user authentication, especially in pam. I think it is very powerful, but it is also complicated. I have not found any good information on the Internet. I can't help but study it myself. Today, I

Check the port number opened on the server in Linux. Before discussing this issue, let's take a look at computer concepts such as physical ports, logical ports, and port numbers. Concepts related to ports: In network technology, a Port can be a

This is a creation in Article, where the information may have evolved or changed. Network of Golang The Go Language standard library provides NET packages that support network operations based on the IP layer, TCP/UDP layer, and higher (such as

1. What is proxy? ; In computer terms, proxy is called proxy server. Its function is to obtain network information by proxy network users. It is a transfer station for network information. In general, when we use a web browser to directly connect to

Turn from: HTTPS Unidirectional authentication Instructions _ digital certificate, digital signature, SSL (TLS), SASLBecause TLS + SASL is used in the project to do the security authentication layer. So read some online information, here to do a

FTP servers are computers that provide storage space on the Internet. They provide services according to the FTP protocol. RHEL 5 is a stable computer system, so it is very important for RHEL 5 to build FTP. Setting up FTP in RHEL 5 is a rigorous