Therefore, when capturing packets, there should be only five locally cached read emails on the MUA client and one unread email that has not been downloaded on the server. Similarly, TLS/SSL encryption is not used for data analysis, but the results are not a problem.Īfter logging in, the test account automatically synchronizes the five existing emails in the inbox, and then I sent another email to the test account. The protocol tested is POP3 and the default port is 110. Wireshark is still used in the packet capture tool. It can "only download mail and not delete it on the server", which is also the mainstream operation mode of POP3 at present. The improved POP3 protocol can be selected in the configuration. The old version of POP3 protocol will delete the mail on the mail server after the mail is downloaded. This offline access mode is a store and forward service, which sends mail from the mail server to the personal client, which can be a variety of devices such as PC or mobile phone. The specific process is: the sender sends the mail to the server, the recipient client uses MUA to connect to the server, and downloads all unread emails. The latest version is POP3, whose full name is "Post Office Protocol - Version 3", and the POP3 protocol that provides SSL encryption is called POP3S. This protocol is mainly used to support the remote management of e-mail on the server using the client. Post Office Protocol (English: Post Office Protocol, abbreviation: pop) is a member of TCP/IP protocol family and is defined by RFC 1939. This paper mainly uses Wireshark to analyze the process of receiving e-mail by using POP3 protocol, and uses telnet command for simple operation.
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