Script Not Emailing

[dinosaw]

I performed the steps according to the instructions:

$ git clone https://github.com/ioexception-de/website-changes-notifications.git
$ cd website-changes-notifications/simple-webpage/
$ mkdir tmp/
$ ./check-for-changes.sh john@doe.de "http://foo.bar/"    # obviously replacing the email / site

This is for a very simple page with a single word on it.

You state that Once initialized you should get a mail, which I never received. So when I try and manually initialize the script again with the same command, I get the following:

$ ./check-for-changes.sh john@doe.de "http://foo.bar/"
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100     9  100     9    0     0    569      0 --:--:-- --:--:-- --:--:--   600
sending mail..
./check-for-changes.sh: 34: ./check-for-changes.sh: mail: not found

Any idea what could be wrong, or what I could be doing wrong? Thanks!