What is “swaks” Package?

SMTP command-line test tool
For more details: http://www.jetmore.org/john/code/swaks/

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 swaks.

  brew install swaks

Now, use swaks!