IMAP is an abbreviation of Internet Message Access Protocol. As its name implies, it mainly provides an agreement for obtaining information through the Internet. IMAP provides a convenient email download service like POP, allowing users to read offline, but IMAP can accomplish more than this. The summary browsing function provided by IMAP allows you to make a decision on whether to download after you have read all the message arrival time, subject, sender, size and other information.
The full name of POP is Post Office Protocol, which is the post office protocol. It is used for e-mail reception. It uses the TCP port 110. Now it is the third edition. So it is called POP3. POP3 still uses Client/Server mode of operation. When the client needs services, the client's software (OutlookExpress or FoxMail) will establish a TCP connection with the POP3 server, after which it will go through three working states of the POP3 protocol, the first is the authentication process, confirm the client provides the user name and password, in the certification After passing through, it enters the processing state. In this state, the user can receive its own mail or delete the mail. After the response is completed, the client issues the quit command, and then enters the update state, and the mail to be deleted is deleted from The server is deleted. The entire POP process has been completed so far.
SMTP is called the Simple Mail Transfer Protocol. The goal is to provide users with efficient and reliable mail transmission. An important feature of SMTP is that it can relay mail during transmission, that is, mail can be relayed via hosts on different networks. Work in two situations: First, the email is transmitted from the client to the server; the second is from one server to another server. SMTP is a request/response protocol that listens on port 25 to receive user's Mail requests and establish an SMTP connection with the remote Mail server.
5730 LEDs,0.5W SMD LED,LED Lamp
enghua Jade Motor Co., Ltd. , http://www.nsledbulb.com