Not Delivered (bad e-mail address)?

N

NuView Realty

I created a marketing campaign and out of nearly 1000 contacts, my report
shows only 8 were delivered. What would cause this error other than a "bad
e-mail address", I know the e-mail addresses to be accurate because I have
used them in other programs. I want to note that I imported all contacts at
once using Excel. I am curious to know why only 8 worked and what I can do to
resolve this.
 
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