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A HUGE amount of leads are not included in a campaign. Any idea why? Or have an idea for a smart list I can run to figure it out?

Question asked by 905e3d2f91630ac39887967c6a078f2ea1f57aaf on Nov 19, 2014
Latest reply on Nov 19, 2014 by Josh Hill

I've read prior discussions on this topic, but I can't for the life of me figure this out. 

Their are 14k leads in a stream in an engagement program. An email went out yesterday, and only 500 received it. No one is marketing suspended. Only around 50 are unsubscribed. Only 2 people have no email address. Around 1500 emails are invalid. I'm lost as to why the rest were not included. Does anyone have additional ideas? Thanks!