1) SMTP and POP3:
SMTP Protocol:
The SMTP (Simple Mail Transfer Protocol) protocol is used by the Mail Transfer Agent (MTA) to deliver your eMail to the recipient's mail server. The SMTP protocol can only be used to send emails, not to receive them. Depending on your network / ISP settings, you may only be able to use the SMTP protocol under certain conditions.
The POP3 (Post Office Protocol 3) protocol provides a simple, standardized way for users to access mailboxes and download messages to their computers.When using the POP protocol all your eMail messages will be downloaded from the mail server to your local computer. You can choose to leave copies of your eMails on the server as well. The advantage is that once your messages are downloaded you can cut the internet connection and read your eMail at your leisure without incuring further communication costs. On the other hand you might have transferred a lot of message (including spam or viruses) in which you are not at all interested at this point.
The SMTP (Simple Mail Transfer Protocol) protocol is used by the Mail Transfer Agent (MTA) to deliver your eMail to the recipient's mail server. The SMTP protocol can only be used to send emails, not to receive them. Depending on your network / ISP settings, you may only be able to use the SMTP protocol under certain conditions.
The POP3 (Post Office Protocol 3) protocol provides a simple, standardized way for users to access mailboxes and download messages to their computers.When using the POP protocol all your eMail messages will be downloaded from the mail server to your local computer. You can choose to leave copies of your eMails on the server as well. The advantage is that once your messages are downloaded you can cut the internet connection and read your eMail at your leisure without incuring further communication costs. On the other hand you might have transferred a lot of message (including spam or viruses) in which you are not at all interested at this point.
The basic difference between IMAP and POP3 is that with POP3 you work most of the time offline because you only connect to the server to download new mail to your computer. This means you have to check your server mailbox periodically. Access from multiple computers/clients is possible by leaving your new mail on the server, but problematic. IMAP, on the other hand, allows you to always work with your mail live on the server. This means that a connection is made and typically maintained through your entire email session.
3) What is IMAP?
IMAP stands for Internet Message Access Protocol. It, like POP, is a way of accessing your email on servers. The primary advantage to IMAP is that since it maintains the original emails on the server, no matter how many different machines you login from you will have complete access to all your email. It also let’s you work with an unlimited number of server-side folders, which makes IMAP a perfect companion to server-side email filtering and Spam administration (see Procmail and Spamassassin).
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