Ubuntu (12.04 LTS) doesn't seem to install any sort of mailer by default.
Everybody seems to recommend installing Postfix. I am familiar with Postfix, which I use on several "real" servers.
But it feels wrong to install a heavy-duty fully featured mail server on a desktop, just so that (ana)cron emails have somewhere to go. There must be a more light-weight solution for such a trivial local-only task .
Which is the simplest mailer to install on my notebook, just so that system emails like cron errors are saved somewhere (just written to /var/mail/username would be sufficient).