A properly configured
system should be able to send emails from the shell using the
at provides a handy way of sending reminders to yourself.
echo "mail -s 'Remember to buy eggs on your way home' firstname.lastname@example.org < /dev/null" | at 16:30
At 16:300, this will send an email to
email@example.com with the subject
Remember to buy eggs on your way home
and an empty body.