The abandoned cart notification email functionality has been upgraded by the addition of a new option that restricts the issuing of these types of notification for a given period. This period is set by a WSM option under Marketing->Communication->Period during which and Abandoned Cart follow-up email is not repeated.
This feature is fully described in this post.
This is available on the beta branch 8th August 2016.
This option only has an effect if the WSM option Marketing->Communication->Enable Abandoned Cart Follo-up E-mail is enabled.