Once you can email yourself from the CLI (See PostFix) you are ready for ZoneMinder Configuration.
Inside ZoneMinder, head to Options >> EMail
%EV% = Attach the event as a video.
Now to test!
To do this, you need to create a filter. Lets first set the Camera in Modect Mode & "Force Alarm" to detect Motion then head to filters.
Create Filter to send e-mail.
Execute to test. Watch Logs.
Once it is working to your liking, you can fine tune.