Example image of eyePlorer eyePlorer map for 'Simple Mail Transfer Protocol': E-mail Internet Protocol Internet standard Extended SMTP Message transfer agent Open mail relay Internet Message Access Protocol Post Office Protocol Electronic messaging Mainframe computer ARPANET BBN Technologies Ray Tomlinson Internet File Transfer Protocol Jon Postel Mail Transfer Protocol Usenet UUCP Push technology Store and forward Usenet newsgroup Sender Rewriting Scheme Sendmail Exim Microsoft Exchange Server Novell GroupWise Postfix (software) Qmail Sun Java System Messaging Server Email client Mail submission agent E-mail spam World Wide Web ASCII MIME 8-bit clean Eric Allman John Klensin Keith Moore Ned Freed Domain Name System MX record Transmission Control Protocol Mail delivery agent Email forwarding Local Mail Transfer Protocol Mbox Webmail Bounce address