DELIVERY PROTOCOLS
The delivery protocols decide how the mail is transferred by the mail transfer agent to the user agent which provides an interface for reading mails.
There are 3 kinds
1. POP3 (Post Office Protocol) Here the mail person accesses the mail box from say a PC and the mail gets accumulated on a server. So in case of POP3 the mail is downloaded to the PC at a time interval which can be specified by the user. POP3 is used when the mail is all the time read from the same machine, therefore it helps to download the mail to it in advance.
2.IMAP(Intermediate Mail Access Protocol) Here the user may access the mail box on the server from different machines so there is no point in downloading the mail before hand. In its place when the mail has to be read one has to log on to the server. (IMAP therefore provides authentication) The mailbox on the server can be looked upon as a relational database.
3.DMSP(Distributive Mail System Protocol) There are multiple mailboxes on diverse servers. To read the mail I connect to them from time to time and whenever I do so the mail will be downloaded. When a reply is sent then it will put the message in a queue. Therefore DMSP is like a pseudo MTA.
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