Example image of eyePlorer eyePlorer map for 'Extended SMTP': Simple Mail Transfer Protocol Internet Engineering Task Force Internet Assigned Numbers Authority On-Demand Mail Relay Transport Layer Security UTF-8 Variable envelope return path Postfix (software) Sendmail ASCII E-mail Binary-to-text encoding Email client UTF-7 Apache James Exim Microsoft Exchange Server Netscape Qmail Authentication Message transfer agent E-mail spam Bounce address E-mail spoofing Brute force attack Password policy CRAM-MD5 Internet Message Access Protocol Simple Authentication and Security Layer Axigen Courier Mail Server Fetchmail Local Mail Transfer Protocol XMail Hydra (software) Quoted-printable Smart host MIME POP before SMTP Unicode and e-mail Transparency (telecommunication) Half-width kana MDaemon Email Server for Windows Mail submission agent Open mail relay Auth Chunking Anti-spam techniques