Hello @drdjmoran ,
I'd recommend checking out this post in our Community as a sort of nexus for general "getting started"-related guides, as well as our Community's Onboarding Hub.
If you've imported the contacts within the last 7 days, you can check your import/export activity to see why some contacts wouldn't have uploaded - reasons can be improperly entered email addresses that you can correct/ignore, missing email addresses, or duplicates. Our system wouldn't have anyway of telling if an uploaded contact is no longer valid until you've actually tried to send to them through us, so any that didn't upload wouldn't be considered bounces like non-existent yet.
If someone is unfamiliar with these kinds of systems, or even just unfamiliar with ours, they can have a lot of questions while getting started. That's why we have our Knowledge Base (also available within your account via the Help tab), and our support staff. When it comes to your particular situation, it's also not uncommon, as not every CRM or ESP keeps track of duplicates, and some do allow contacts without email addresses. Different systems will have different quirks and functionalities of even basic elements like contacts and email scheduling, so it's completely valid to have questions about how our system works. Asking these questions, and reading up on relevant help info before diving in too deep is highly recommended.
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