What is SMTP for Aliyun mailboxes

The full name of SMTP is "Simple Mail Transfer Protocol", which is simply a message transfer protocol. It is a set of specifications for transmitting messages from the source address to the destination to control how the message is relayed. The SMTP protocol belongs to the TCP/IP protocol cluster, which helps each computer find the next destination when sending or relaying letters. The SMTP server is the outgoing mail server that follows the SMTP protocol.

(SMTP authentication, simply, requires that you have to provide an account name and password before you can log on to the SMTP server, which makes it easy for spammers to do so.) The purpose of increasing SMTP authentication is to protect users from spam. )

The Aliyun mailbox already supports POP3 receipt and SMTP letter, which is turned off by default and requires you to manually open it.