nullmailer - Sending failed: Could not exec program

[compdoc]

> Since I installed nullmailer, it appears to have at least been trying -
this I think counts as progress.

Yes, you are sending something. I tend to use the command:     mail
someone at somewhere.com

I've been having to add nullmailer to Ubuntu for some time. Apologies if
your Ubuntu version was already capable.

Anyway, you may need to correct the line in /etc/nullmailer/remotes. I don't
use a password for mine, but it's a local mail server. 

And be sure to add an email address to send to in  /etc/nullmailer/adminaddr