courier-authlib-ldap software package provides LDAP support for the Courier authentication library, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install courier-authlib-ldap
courier-authlib-ldap is installed in your system.
Make ensure the courier-authlib-ldap package were installed using the commands given below,
$ sudo dpkg-query -l | grep courier-authlib-ldap *
You will get with courier-authlib-ldap package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | |
| Package | courier-authlib-ldap |
| Version | 0.66.4-7 |
| Description | LDAP support for the Courier authentication library |
| Sub Section |