Send a simple message from the command-line

Need to send yourself or someone else a quick email from the Linux command-line?  Use mutt.  First I compose the message in a file, e.g. msg.txt.  Then cat it, and invoke mutt.  The example below also includes an attachment – a  python script I was sending myself.

cat msg.txt | mutt -s "version 2.0" -n -a sample.py me@example.com

Options:
-n – bypass the system configuration
-s – subject
-a – attach a file