Using your mailbox as a task list also saves you from having to use inefficient paper-based cards to track your tasks.
Figure: Bad Example - A bad email is one that gives no clear action items Figure: Good Example - A good email has a clear next step action point
It is better that email is not used as communication, but for many instances, if the person is unavailable, it is better to send the email, than not. If you can’t do an ‘as per our conversation’ then add some text at the top of the email. e.g.
"As per the message I left on your phone…" and detail the questions you would like answered.
Make sure to number your tasks, if there is more than one, as per "Do you number small tasks related to 1 topic