---
name: "fud"
section: "8"
platform: "linux"
package: "cyrus-common"
version: "2.4.17+nocaldav-0+deb8u2"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/fud"
---

# fud(8)

provide information about user mailboxes

 \*

## NAME

FUD - provide information about user mailboxes

## SYNOPSIS

**fud** \[ **-C** *config-file* \] \[ **-U** *uses* \] \[ **-T** *timeout* \] \[ **-D** \]

## DESCRIPTION

**FUD** is a long lived datagram daemon started from cyrmaster that provides information about when a user last read their mail, when mail last arrived in a user's mailbox, and how many messages are recent for that user.

Note that for **FUD** to run properly you must set proto=udp in its cyrus.conf services entry.  prefork=1 is also recommended. **FUD** will automatically proxy any and all FUD requests to the appropriate backend server if it is runing on a Cyrus Murder frontend machine.

**FUD** reads its configuration options out of the [*imapd.conf*(5)](/imapd.conf/5.md) file unless specified otherwise by **-C**.

## OPTIONS

- **-C** *config-file*

  Read configuration options from *config-file*.

- **-U** *uses*

  The maximum number of times that the process should be used for new connections before shutting down.  The default is 250.

- **-T** *timeout*

  The number of seconds that the process will wait for a new connection before shutting down.  Note that a value of 0 (zero) will disable the timeout.  The default is 60.

- **-D**

  Run external debugger specified in debug\_command.

## FILES

- **/etc/imapd.conf**

  Default configuration file.

- **/etc/cyrus.conf**

  Cyrus Master process configuration file.

## BUGS

Though not really a bug,  **FUD** will silently ignore any requests that it does not consider valid.

Also not really a bug, **FUD** requires that the anonymous user has the 0 (zero) right on the mailbox in question.  This is only a "bug" because 0 is not a standard IMAP ACL bit.

**FUD** is an experimental interface meant to provide information to build a finger-like service around.  Eventually it should be superceded by a more standards-based protocol.