Install libpfqueue-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libpfqueue-dev
Description:
interactive console-based tool to control MTA queues (development)
pfqueue is a queue manager for different MTAs (currently postfix and exim), allowing to delete, hold, release, or requeue messages. . This package contains the development files.
Homepage: http://pfqueue.sourceforge.net/
Version: 0.5.6-9build2
Section: universe/libdevel