What is “offlineimap” Package?

Synchronizes emails between two repositories
For more details: http://offlineimap.org/

Installation

• Open Terminal by pressing command+space then type terminal and hit Enter key.
• Install homebrew first.

  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

• Install offlineimap.

  brew install offlineimap

Now, use offlineimap!