Email Campaign Creation & List Cleanup

I’m gearing up to restart product-focused email promotions, but my house list is dated and I don’t want to land in spam folders. The first priority is to run a full verification and hygiene sweep so we know exactly which addresses are still active... (Budget: $30 - $250 USD, Jobs: Content Writing, Copywriting, Email Campaign, Email Marketing, Google Adwords, Internet Marketing, Mailchimp, Marketing Strategy)