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E-Mail Protocols (SMTP, POP and IMAP)
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In the previous article, we dealt with the technical features of the email service (which we use from time to time). Therefore, in this post, we will delve further into the process of retrieving emails from the server to the client system. We have already seen the details of the SMTP (Message Transfer Agent) protocol and User Agent. Now we will examine the message access broker used in this process. Before we proceed, you can refer to the image below for clarity. Tier 1 and Tier 2 email delivery systems (see diagram above) primarily use the SMTP protocol. Still, SMTP is not found at all in the third stage, because SMTP is basically a push protocol, so it pushes the message data from the client (client) to the desired server host. In short, it can be sa that the path (direction of movement) associated with bulk data (data message flow) leads from the client to the corresponding destination server. On the other hand, the third phase ultimately requires a pull protocol, where the client should query the server for messages (retrieve mail messages). The flu movement of any data set is usually from the server se to a specific host device (client). The third stage therefore uses MAA (Message Access Agent). There are two Message Access Brokers available and they are as follows: Post Office Protocol, Version 3 (POP 3). Internet Mail Access Protocol (IMAP 4). (See the diagram above for exactly where these protocols are implemented in each email application process).
Post Office Protocol 3 (POP version 3)
Post Office Protocol (version 3, also known as POP3) is simple and has limited functionality. The client (client) POP3 software is initially installed on the recipient’s PC, and the host (server) POP3 software is further set up in the mail server (POP3 essentially consists of two software, client POP3 and server POP3). .Only when indivual users (clients) want to download emails from mailboxes on the mail server, start accessing mail on the client se. In this case, the sequence of events is as follows: The client (user) establishes a connection with the host server on TCP slot 110..then the client sends its username and password to the server to perform this access to the mailbox ( e.g. Gmail login). After successful authentication, the user can now access the mailbox. The user can then finally list and restore the corresponding email messages one by one.
Modes of POP 3 :
The POP 3 protocol has two modes of operation: delete mode and . maintain mode. Delete Mode: With this special mode, messages are deleted from special mailboxes after each retrieval. Delete mode is most commonly used when users are working on their PCs and can save and further organize incoming emails after reading or replying. Retention Mode: Retention mode is typically used when any user accesses email outse of their primary computer, such as a PC or laptop. The mail is then read and saved in the system for later retrieval. Disadvantage of POP 3: Users cannot create additional folders on the server. Users also can’t view parts of the email before downloading it.
Internet Mail Access Protocol 4 (IMAP version 4)
Another email access protocol is the Internet Mail Access Protocol (Pull Protocol) version 4 (IMAP4). IMAP4 is very similar to POP3, but generally has more features. IMAP4 is more powerful and more complex. This is eal for users with multiple computers such as office laptops, home PCs, etc. Users can finally search email headers before downloading them. IMAP basically creates a central repository that can be further accessed from any computer. Therefore, the email is not copied to the user’s personal computer. Users may be able to partially download each email. This is especially useful if bandwth is very limited and the email contains multimedia with very high bandwth requirements. Additional features of IMAP 4: Users can create, rename or delete mailboxes on the mail server. The user can browse the desired content of the email before downloading. Users can also create sequential hierarchies of mailboxes in any folder in the mail store. Users can partially download emails. You can refer to the table below to compare the two pull protocols: Sr No Parameters POP 3 IMAP 1 TCP Ports Used 110 143 2 Emails Offline Readable Online 3 Multiple Mailboxes Impossible 4 Partial Message Downloads Yes 5 Who Backup Mailbox Users ISP.
Web based Mail
There are websites such as Yahoo and Hotmail that prove email services to all users who visit the site. In this case, the mail is transferred from the sender to the mail server over HTTP (explained in a later post). Use the SMTP protocol to transfer messages from outgoing mail servers to receiving mail servers. Then, in the final stage (pulling mail from the server to the client’s system), use HTTP (instead of POP or IMAP). When a recipient sends a message to the website, the user can retrieve the email. The website sends a registration form (with a login and password) to the recipient. If the credentials proved by the user match correctly, the email will be transmitted from the website to the recipient in HTML format. We’re finally done with a full understanding of what the email service does (how messaging/retrieval really works). For the other two articles in this series, you can check out the User-Agent and SMTP articles directly here. In the next article, we will see the next interesting application of the application layer, which is H. File sharing using the FTP protocol. So stay tuned. report this ad
What is POP and IMAP in email?
Post Office Protocol (POP3) Internet Message Access Protocol (IMAP) POP is a simple protocol that only allows downloading messages from your Inbox to your local computer. IMAP is much more advanced and allows you the user to see all the folders on the mail server.
What is difference POP3 and IMAP?
POP3 only allows a single device at a time to access the emails. IMAP allows multiple devices at a time to access and read the available mails. A user cannot update or create emails on the mail server by using the POP3 protocol. You can use the IMAP protocol for updating or creating emails.
What is POP3 IMAP access?
IMAP is one of the most common protocols for receiving email. IMAP syncs messages across all devices. POP3 is another protocol for receiving email on a single device. Using POP3 means that your email will be accessible offline and deleted from the server.
What is Message Access Agent?
Message Access Agent: POP and IMAP. The first and the second stages of mail delivery use SMTP. However, SMTP is not involved in the third stage because SMTP is a push protocol; it pushes the message from the client to the server. In other words, the direction of the bulk data (messages) is from the client to the server …
Is Gmail a POP or IMAP?
Gmail provides IMAP access to your Gmail account, so you can connect to your email from mobile devices and desktop email clients.
Is Outlook a POP or IMAP?
Outlook supports standard POP3/IMAP email accounts, Microsoft Exchange or Microsoft 365 accounts, and webmail accounts including Outlook.com, Hotmail, iCloud, Gmail, Yahoo, and more.
Which is safer IMAP or POP?
If you care risks introduced by the implementation of the protocol in server or client: IMAP is a way more complex protocol than POP and thus the risks of an insecure implementation are much higher there.
Why POP3 is used?
Post Office Protocol 3, or POP3, is the most commonly used protocol for receiving email over the internet. This standard protocol, which most email servers and their clients support, is used to receive emails from a remote server and send to a local client.
What is the difference between POP and POP3?
In computing, the Post Office Protocol (POP) is an application-layer Internet standard protocol used by e-mail clients to retrieve e-mail from a mail server. POP version 3 (POP3) is the version in common use, and along with IMAP the most common protocols for email retrieval.
Who uses POP3?
IMAP and POP3 are the two most commonly used Internet mail protocols for retrieving emails. Both protocols are supported by all modern email clients and web servers.
What is a POP email account?
POP, short for the Post Office Protocol, is used to sync email from Gmail to any compatible mail client, such as Outlook, Thunderbird, or Apple Mail. Like IMAP, POP is not a Google product; it’s a standardized, RFC-compliant protocol that any email service or client can choose to be compatible with.
What is the difference between IMAP and SMTP?
IMAP is used to retrieve messages, while SMTP is for sending them. IMAP works between the server and client for communication, whereas SMTP works between servers to transfer information. The former is a message transfer agent between user and server, and the latter is a message transfer agent between servers.
What is IMAP account?
IMAP allows you to access your email wherever you are, from any device. When you read an email message using IMAP, you aren’t actually downloading or storing it on your computer; instead, you’re reading it from the email service.
What is IMAP email program?
IMAP stands for “Internet Message Access Protocol”. It’s a fancy name for a protocol used by email programs like Outlook, Thunderbird, and others to access your email.
What is IMAP protocol used for?
Internet Message Access Protocol (IMAP) is a protocol for accessing email or bulletin board messages from a (possibly shared) mail server or service. IMAP allows a client e-mail program to access remote message stores as if they were local.
See some more details on the topic Email Services – Message Access Agents (POP and IMAP) here:
Email Services – Message Access Agents (POP and IMAP)
In this post i.e Email Services – Message Access Agents (POP and IMAP),you can get complete indepth overview of the message access agents …
What is IMAP (Internet Message Access Protocol)? – TechTarget
The IMAP email protocol stores messages on a server, enabling recipients to view them from any device or location. See why IMAP offers advantages over POP3.
Email Protocols – POP3, SMTP and IMAP Tutorial – SiteGround
In this tutorial, you’ll learn what are the 3 email protocols – POP3, SMTP and IMAP – and understand what are their specific functions and purpose.
What are IMAP and POP? – Microsoft Support
IMAP and POP are two methods to access email. IMAP is the recommended method when you need to check your emails from several different devices, …
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