Mail is installed as part of mailutils and mailx packages on Debian and Redhat systems respectively. Linux mail command is quite popular and is commonly used to send emails from the command line.

I recommend having a gmail account used just for smtp email sending, so you don't have to keep your primary accounts password stored in a plain text file on your. I'll go through a basic setup to use gmail's smtp servers. ) and all members on the list will recieve the email. It allows list users to send a single email to the list email address (i.e. Mailman is a server based email list and web based list member management software.