Email uses different protocols to send and receive emails depending on the method used for sending, receiving, and storing/accessing emails. The three protocols used are:
- Simple Mail Transfer Protocol (SMTP)
- Post Office Protocol (POP3)
- Internet Message Access Protocol (IMAP)
SMTP uses port 25 and is used for sending emails.
POP3 uses port 110 and is used to retrieve emails by downloading them from the email server to the client. Microsoft Outlook is an example of a POP3 client.
IMAP4 uses port 143 and is similar to POP3 in that it retrieves email but leaves a copy of the email on the server and can be accessed anywhere through a web browser, commonly referred to as webmail. Gmail and Yahoo are examples of webmail. ...
