Which Protocol Can Be Used to Transfer Messages From an Email Server to an Email Client?
What is POP3 (Post Office Protocol three)?
Postal service Part Protocol 3, or POP3, is the virtually normally used protocol for receiving electronic mail over the cyberspace. This standard protocol, which most email servers and their clients support, is used to receive emails from a remote server and transport to a local customer.
POP3 is a i-fashion client-server protocol in which e-mail is received and held on the email server. The "3" refers to the 3rd version of the original Pop protocol.
A recipient or their e-mail customer can download mail periodically from the server using POP3. Thus, POP3 offers a means of downloading e-mail from a server to the client so the recipient can view the email offline. POP3 can exist thought of every bit a "shop-and-forward" service.
One time the email is on the client, POP3 and so deletes it from the server. With some implementations, users or an administrator can specify that mail be saved for some time, allowing users to download email as many times every bit they wish within the specified catamenia.
POP3 and e-mail applications
POP3 is built into most popular email clients, including Microsoft Outlook. The protocol volition work provided that the email program is configured to host POP3. Each POP3 mail server has a unlike address that must be entered into the e-mail program for it to connect with the protocol. Users must likewise enter their username and password to receive e-mail successfully.
Additionally, since POP3 is built into standard cyberspace browsers, including Net Explorer and Mozilla Thunderbird, users can bank check their email even without an email client.
POP3 ports
POP3 works on the following two ports by default:
- port 110: default, non-encrypted port; and
- port 995: should be used when the user needs to connect using POP3 deeply.
How POP3 operates
The server starts POP3 service by listening on TCP port 110. When a client wishes to utilize POP3 for e-mail retrieval, it establishes a TCP connectedness with the server host. Once this connection is established, the POP3 server sends a greeting. At this indicate, the session enters the authority state.
In the transaction country that follows, the client and server substitution commands and responses until the connection is either closed or aborted. Commands from the client consist of case-insensitive keywords, maybe followed by arguments. Responses from the server consist of a status indicator and a keyword, which may be followed by additional information.
When the client problems the quit command, the session enters the update country. The POP3 server releases whatsoever resources acquired during the transaction state, and says "goodbye," which is when the TCP connection is airtight.
After the POP3 session enters the update country, the POP3 server deletes the message.
Advantages and limitations of POP3
Although POP3 has been enhanced many times since it originated in the late 1980s, it remains popular because of its simplicity. Another reason for its ubiquity is that it enables email to exist retrieved efficiently with minimal errors.
The protocol is platonic when users need to access their e-mail offline and they use a designated device for retrieval. POP3 is also useful for sending and storing bulk electronic mail messages.
POP3 is non intended to back up e-mail manipulation or synchronization on the server, since the email is meant to exist downloaded to the client so deleted from the server. For these utilise cases, the more advanced and complex Internet Message Admission Protocol (IMAP) is used.
IMAP can also poll an existing connection for newly arrived letters, and it supports multiple folders on the server. POP3 doesn't have these capabilities.
How are POP3, IMAP and SMTP related?
IMAP is an alternative email retrieval protocol. Similar to a remote file server, IMAP allows the user to retain electronic mail on the server, where the email can be organized in folders.
Similar POP3, IMAP is supported by all modernistic email clients and web servers. But different POP3, IMAP also synchronizes the email beyond multiple devices or clients, making it more suitable than POP3 when a user is working with many devices or wants to admission email from multiple locations. IMAP works on ports 143 and 993.
POP3 and IMAP both pertain to the receipt of email only differ from the Uncomplicated Mail Transfer Protocol (SMTP), a protocol for transferring electronic mail beyond the internet. SMTP sends email, a mail handler receives it on the recipient'due south behalf, and the post is read using POP3 or IMAP.
This was last updated in October 2021
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Source: https://whatis.techtarget.com/definition/POP3-Post-Office-Protocol-3
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