Definitions for "Bounce rate"
The percentage of web site visitors who arrive at a web site entry page, then leave without going any deeper into the site.
Percentage of visitors who leave a website on the entry page without clicking further into the website. A high bounce rate indicates that visitors are not finding what they were looking for on the page.
This indicates the percentage of visitors who entered one particular page and left from the same page without going to any other page on the website.
Keywords:  nxx, npa, inexact, undeliverable, sent
Also return rate: Number of hard/soft bounces divided by the number of emails sent. This is an inexact number because some systems do not report back to the sender clearly or accurately.
The number of emails that were returned as undeliverable divided by the total number of emails sent (multiply this number by 100 to express the result as a percentage).
Email Blast NPA-NXX