Jul 20, 2023

Implementation of `WHO iS ONline’ protocol

This software is supposed to work as a “reference implementation” of the suggested “whoson” internet protocol. The protocol is expected to be employed on “spam relay protected” mail servers to allow traveling customers still send their email via the protected server. For this, a realtime database of “temporarily trusted” IP addresses is maintained by a special daemon program. The database may be filled by, e.g. POP/IMAP servers, and used by SMTP server. Another possible use of the protocol is to have the database filled by RADIUS/TACACS server for all dialup clients, and SMTP server using it to put the user identity into the “Received” header along with the source IP address. The protocol itself is defined in a separate document “whoson.txt”.

Checkout these related ports:
  • Xpbiff -
  • Xmailwatcher - Mailbox checker which displays sender and subject lines of mails
  • Xmailbox - Mailbox checker with sound and animation for X Window System
  • Xmail - X-based interface to the Berkeley mail program
  • Xfce4-mailwatch-plugin - Mail notification applet for the Xfce panel
  • Xfaces - Display shaped icons for mail spool contents
  • Xcite - Exciting Cite for any Mail/News reading modes on Emacs
  • Xbuffy - Replacement for xbiff that handles multiple mail files
  • X-face-e21 - X-Face utilities for Emacs
  • Wmmaiload - Incoming mail monitor dockapp with a similar look to wmcpuload
  • Wmbiff -
  • Websieve - Web based Cyrus IMAP user admin client
  • Wanderlust - Mail and news system for Emacs
  • Vrfy - Verify mail address
  • Vqadmin - CGI-based Virtual Qmail Domains Administrator