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 Table (1) SMTP CodeCode definition421 service not available, hosts in the closing transmission channel brackets cannot provide normal services, close the transmission pipeline, and emails will be stuck on the host450 requested mail action not taken:

The Yahoo team summarizes the experience of website performance optimization, which is of great reference value.English Original: http://developer.yahoo.com/performance/rules.html1. Minimize the number of HTTP requests 80% of the end-user response

English Original: http://developer.yahoo.com/performance/rules.htmlChinese Original: http://www.ha97.com/2710.html1. Minimize the number of HTTP requests 80% of the end-user response time is used to download the content. This part of the time

1. Minimize the number of HTTP requestsIn the end user response time, 80% is used to download the content, this part of the time includes the download page image, style sheet, script, flash and so on. Reducing the number of HTTP requests by

Ext: http://www.cnblogs.com/zcy_soft/archive/2013/09/23/3335235.html DNS a record NS record MX record CNAME record txt record TTL value PTR valueConstruction Station noun Explanation: DNS a record NS record MX record CNAME record txt record TTL

34 Golden rules for Yahoo! website performance Best Experience Yahoo! 's exceptional Performance team brings best practices for improving Web performance. They conducted a series of experiments, developed tools, wrote a large number of articles and

Http://developer.yahoo.com/performance/rules.html Yahoo! The predictional performance team brings best practices to improve web performance. They conducted a series of experiments, developed various tools, wrote a lot of articles and blogs, and

Yahoo! The predictional performance team brings best practices to improve web performance. They conducted a series of experiments, developed various tools, and wrote a lotArticleAnd blogs and participate in discussions at various meetings. The core

Yahoo Team Experience: 34 golden codes for website page Performance Optimization 1. Minimize the number of HTTP requests 2. Reduce DNS lookup timesThe Domain Name System (DNS) provides a ing relationship between the domain name and the IP address,

So far, there are no good tutorials on the Internet to learn about. I will install and debug the MDaemon server for the first time, collect some MDaemon problems by asking questions, and summarize them to share with you! 1. How do I enter the