The current program could be modified to send mail reminder too. One of my most controversial programs exposes a unique security hole relying on typing errors. Nothing prevents Trojan horses from being installed, of course. My program differs from a Trojan horse subtly because I do not advertise its use. It so happens that some common commands such as more , if misspelt, invoke my program.
All common misspellings invoke the same program which figures out which misspelling was perpetrated.
Many, many typographical errors have been caught. Though these look like rudimentary and early-effort Perl programs, I like these because they are very concise. This is a simple Perl program that tells you of new mail in the current text shell. This works like a better biff , telling me of the person and subject of new mail. A decent programmer should be able to change this script to perform the same objective on any network of Unix systems.