---
name: "youbind"
section: "8"
platform: "linux"
package: "youbin"
version: "3.4-2"
release: "Debian 3.0 (Woody)"
platforms: ["linux"]
url: "https://new.carta.tech/youbind"
---

# youbind(8)

Server of youbin service

## NAME

youbind - Server of youbin service

## SYNOPSIS

**youbind** \[ **-d** \] \[ **-h** \] \[ **-t** \] \[ **-A** *port* **\]**

## DESCRIPTION

**youbind is a server of the youbin protocol which is a** **derivation of "biff" protocol suitable for Network age. It has upward** **compatibility to "biff". youbind accepts the client request to** **observe the mail spool of the user specified. When youbind detects the** **change of the mail spool, it will notify the client so. youbin** **communicates with clients periodically to maintain the connection.  It** **detects writing in the spool by receiving the "biff" packet from** **/bin/mail. It detects reading from the spool by polling mechanism.** **However, this polling period is quite long to lighten the load of the** **server. Therefore, it is requested to be informed to the server that** **the mail have read from the spool. Modified version of POP is provided** **to inform youbind when reading mails, since youbin protocol is** **considered to work with POP. mh-inc-hook for this is also provided for** **the user of mh-e of emacs.**

## OPTIONS

- **-d**

  **Various debugging information will be output with this option.** **This information includes log of communication with clients,** **registration and removal of clients, status changes of clients.**

- **-h**

  **Simple explanation of youbind will be output.**

- **-t**

  **Log the information of beginning and end of service.**

- **-A *port***

  **youbind will receive the packet from the specified** **port besides the "biff" port. This option is for the machine which** **uses ports except the "biff" port to inform of the arrival of mail. At** **this time, only MIPS's RISC/os uses the different port named "mbiff".**

## FILES

**/usr/spool/mail         Mail spool directory**

## SEE ALSO

**[biff(1)](/biff/1.md), [youbin(1)](/youbin/1.md), [xyoubin(1)](/xyoubin/1.md)**

## BUGS

**The number of the registered user is limited to 256. The number of** **mail clients is limited to 1024.**

## AUTHORS

**Kiyoshi Agusa           agusa@nuie.nagoya-u.ac.jp**\
 **Shinichirou Yamamoto    yamamoto@nuie.nagoya-u.ac.jp**