E-Mail protocols

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E-MAIL PROTOCOLS


We use E-Mail service very commonly in our life. Basically, we used to send our e-mail to E-mail server that used to store received e-mail message in the recipient’s e-mail inbox. The users use ample numbers of retrieval protocols, so these e-mail protocols will determine whether your e-mail is stored on server or on your computer.

The different protocols are designed for both sending and receiving messages. The user uses POP and IMAP protocols for receiving e-mail messages, while on the other hand the user uses SMTP protocol for sending e-mail messages.

Virtually, all modern e-mail clients and mail server supports both protocols for sending and receiving e-mail messages on or from e-mail server.

Example: Gmail etc.

 

SMTP


SMTP stands for Simple Mail Transfer Protocol

These are also known or said as delivery protocol.

Simple mail transfer protocol (SMTP) is used to send our e-mail messages from a client to e-mail server. Means we can say that we can only send our e-mail from remote device to email server.

By using this SMTP protocol we can’t retrieve message from a remote server on demand as only we can deliver and send our e-mail messages we can’t retrieve them.

Sendmail was one of the first mail transfer agent to implement SMTP.

 

POP3


POP3 stands for Post Office Protocol Version 3

POP3 is also known and said as receiving protocol.

This e-mail receiving protocol allow the user/e-mail client to download e-mail from e-mail server to local remote device.

E-mail client can’t access the e-mail from everywhere because after downloading on local remote the e-mail message got removed from the server.

We can access it only single time from server.

PORTS OF POP3:
Port 110 it is the default non-encrypted port
Port 995 it is secure POP3 port

 

IMAP

 
IMAP stands for Internet Message Access Protocol

IMAP is also a receiving protocol.

This e-mail protocol also allow the user to read e-mail while you are offline and as well as online.

Many duplicate copies of e-mail are available on server.

We can access it many time and from different places as well.

PORTS OF IMAP:
Port 143 is default non-encrypted port of IMAP
Port 993 is the secure port of IMAP
 
People prefer to use IMAP than POP3 protocol, because IMAP provides backup copies of our e-mail and by using this we can access our e-mail multiple times and from different places.

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