It uses TCP port 25:Īs shown in the preceding diagram, SMTP is the email client used to send the mail to the mail server, and POP3 or IMAP is used to retrieve the email from the server. When the sender and receiver are in different email domains, SMTP helps to exchange the mail between servers in different domains.

SMTP: Simple Mail Transfer Protocol ( SMTP) is an application layer protocol that is used to send email from the client to the mail server.

The current version of IMAP is 4 and it uses TCP port 143. With current trends, it is very common to see users with more than one device to access emails (laptop, smartphone, and so on), and the use of IMAP allows the user to access mail any time, from any device. Unlike POP3, IMAP allows the user to read and access the mail concurrently from more than one client device.

IMAP: Internet Mail Access Protocol ( IMAP) is another application layer protocol used to retrieve mail from the email server.

POP3 uses TCP port 110 and wipes the mail from the server once it is downloaded to the local client. The email client uses POP3 commands such as LOGIN, LIST, RETR, DELE, QUIT to access and manipulate (retrieve or delete) the email from the server.

POP3: Post Office Protocol 3 ( POP3) is an application layer protocol used by email systems to retrieve mail from email servers.The three most commonly used application layer protocols are POP3, IMAP, and SMTP: This article is an excerpt from Network Analysis using Wireshark 2 Cookbook – Second Edition written by Nagendra Kumar Nainar, Yogesh Ramdoss, Yoram Orzach. In this article, we will look at the normal operation of email protocols and how to use Wireshark for basic analysis and troubleshooting. There are different email application-layer protocols available for sending and receiving mails, and the combination of these protocols helps with end-to-end email exchange between users in the same or different mail domains. There are various email providers available on the internet, and any user can register to get a free email address. Each user is required to have a human-readable email address in the form of. Email allows users to exchange real-time messages and other digital information such as files and images over the internet in an efficient manner.

One of the co ntributing factors in the evolution of digital marketing and business is email.

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