what is smtp,pop,imap tutorial

Internet Message Access Protocol (IMAP) is a protocol for e-mail retrieval and storage developed by Mark Crispin in 1986 at Stanford University as an alternative to POP Post Office Protocol (POP) is an application-layer Internet standard protocol used by local e-mail clients to retrieve e-mail from a remote server over a TCP/IP connection Simple Mail Transfer Protocol (SMTP) is an Internet standard for electronic mail (e-mail) transmission imap vs pop3 pop3 vs imap pop3 vs smtp smtp vs pop smtp vs ima