---
name: "courierldapaliasd"
section: "8"
platform: "linux"
package: "courier-ldap"
version: "1.4.1-3+deb13u2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/courierldapaliasd"
---

# courierldapaliasd(8)

LDAP-based mail aliasing

## NAME

courierldapaliasd - LDAP-based mail aliasing

## SYNOPSIS

**courierldapaliasd** {start}

**courierldapaliasd** {stop}

**courierldapaliasd** {restart}

**courierldapaliasd** {query} {*source*} {*address*}

## DESCRIPTION

**courierldapaliasd** supports mail address aliasing, as implemented by [**makealiases**(8)](/makealiases/8.md)\[1\] but using an LDAP directory instead of a GDBM or a DB database. The term "aliasing" refers to substituting one or more addresses for another address. A one-to-one substitution results in the Courier mail server accepting mail for one address, and delivering the mail to another address. A one-to-many substitution results in the Courier mail server accepting mail for one address, and delivering a separate copy of the message to every address defined by the alias.

[**makealiases**(8)](/makealiases/8.md)\[1\] uses a GDBM or a DB database to perform the aliasing function. **courierldapaliasd** uses an LDAP directory instead.

"**courierldapaliasd start**" runs the **courierldapaliasd** process in the background, and should be executed at system startup. "**courierldapaliasd stop**" stops the background process. "**courierldapaliasd restart**" restarts the process, and rereads the ldapaliasrc configuration file to pick up any changes. **courierldapaliasd restart** must be executed in order for any changes to ldapaliasrc to take place.

**courierldapaliasd** runs in the background and opens a persistent connection to the LDAP directory, and checks every recipient address using the persistent connection. **courierldapaliasd** automatically starts an adjustable number of multiple processes. With persistent connections being used, this allows alias checking to be as efficient and quick as possible.

"**courierldapaliasd query** *source* *address*" is a diagnostic tool. It requires that **courierldapaliasd** must already be running in the background; it sends a query for *address* to the background process, and prints the result. Like [**makealiases**(8)](/makealiases/8.md)\[1\], it is possible to create aliases that are accessible only to certain sources of mail, like "esmtp" or "local". The "*source*" argument specifies the source of the address, such as "local", "esmtp", or "uucp".

## CONFIGURATION

**courierldapaliasd** requires OpenLDAP client libraries, and is installed automatically if OpenLDAP client libraries are available at installation time. The default ldapaliasrc configuration file contains additional instructions for configuring LDAP-based aliasing.

## FILES

/usr/sbin/courierldapaliasd

/etc/courier/ldapaliasrc

## SEE ALSO

[**dot-courier**(5)](/dot-courier/5.md)\[2\], [**courier**(8)](/courier/8.md)\[3\], [**makealiases**(8)](/makealiases/8.md)\[1\], [**makeuserdb**(8)](/makeuserdb/8.md)\[4\].

## AUTHOR

**Sam Varshavchik**

Author

## NOTES

- 1\.

  [**makealiases**(8)](/makealiases/8.md)

  http://www.courier-mta.org/makealiases.html

- 2\.

  [**dot-courier**(5)](/dot-courier/5.md)

  http://www.courier-mta.org/dot-courier.html

- 3\.

  [**courier**(8)](/courier/8.md)

  http://www.courier-mta.org/courier.html

- 4\.

  [**makeuserdb**(8)](/makeuserdb/8.md)

  http://www.courier-mta.org/makeuserdb.html