Have you tried to use the full path for the mail command?
I'm sorry Falko, but I don't know what the full path for the mail command is.
I am trying to learn about the linux world but I find man pages especially unhelpful for newbs and information on this topic, I have found particulary difficult to find.
I am about to start trying the snail program or ssmtp. As far as I can tell, these don't need a mail server installed on the system, they just use an external mail server and account. (It will also make me feel safer not having a mail server on the system to worry about being compromised. I don't know enough to make it secure.)
I am hoping that I can find an example of a script that uses one of these programs that will work for me or that I can some how work it out by gathering clues.