The POP3 protocol is designed solely and exclusively to receive e-mail, in the download direction, from the mail server to the local mail client. Currently it is very strange that an email service provider does not have support for SSL / TLS in POP3, therefore, we will almost always use TCP port 995 because it provides us with confidentiality, if we use TCP port 110 it means that the traffic of data between the mail server and the local email client is not encrypted, therefore we could have privacy issues. ![]() The POP3 protocol uses the TCP transport layer protocol, makes use of TCP ports 110 for POP3 without data encryption, and TCP port 995 for POP3 with data encryption. This protocol belongs to the application level of the TCP / IP model, currently the latest version is used, which is POP3, the rest of the versions are not used because they are outdated, when we refer to the POP protocol we will always refer to the POP3 protocol. ![]() ![]() This protocol is used by local email clients to obtain email messages from a remote email server, this server is commonly called a mail server or POP3 server. ![]() The POP3 protocol (Post Office Protocol) or also known as “Post Office Protocol”, is one of the fundamental protocols for the management of electronic mail or email.
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