Install libgmime2.6-cil by entering the following commands in the terminal:
sudo apt update sudo apt install libgmime2.6-cil
Description:
CLI binding for the GMime library (old 2.6 version)
GMime provides a core library and set of utilities which may be used for the creation and parsing of messages using the Multipurpose Internet Mail Extension (MIME). . This package contains the CLI binding for the older version of the GMime library. . This package is deprecated. Users should switch to MimeKit instead.
Homepage: https://github.com/jstedfast/gmime/
Version: 2.6.23+dfsg1-2
Section: universe/cli-mono