POP (Post Office Protocol) and IMAP (Internet Message Access Protocol) are two protocols that allow access to mail folders incoming mail server (not allow sending mail). We can refer to POP with POP3 (latest version) and IMAP with IMAP4. These protocols are supported by most existing mail servers.
Advantages and disadvantages of POP3 vs. IMAP4:
The number of transactions is low, which is efficient.
No correlation between the mailing list with the identifiers…