couriertcpd command not found

Introduction

When you run more command in linux terminal / console, you get the following error message

couriertcpd: command not found

or when using sudo you get the following error message

sudo: couriertcpd: command not found

Solutions to couriertcpd: command not found

How To Fix couriertcpd: command not found in Ubuntu / Debian / Kali Linux / Raspbian

In Ubuntu couriertcpd is provided by courier-base package.

courier-base is:

The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols, such as ESMTP, IMAP, POP3, LDAP, TLS, and HTTP. Courier provides ESMTP, IMAP, POP3, webmail, and mailing list services within a single, consistent, framework.

This package provides the functionality needed by all courier packages such as some configuration files, helper programs and the Courier TCP server daemon.

Courier uses the a TLS wrapper application named couriertls instead of embedding TLS support in the different applications. Additionally, this package contains a default set of trusted X.509 root CA certs.

To fix this problem, we can install more using the command below.

sudo apt-get -y install courier-base

This command might take some time to finish depending on your machine internet connection.

You can also use apt command to install courier-base.

sudo apt -y install courier-base

Or if you have aptitude installed you can use the following command.

sudo aptitude install courier-base

Summary

In this tutorial we learn how to fix couriertcpd command not found error in Ubuntu / Debian / Kali Linux or Raspbian distribution.