Levitate, a Raleigh-based marketing platform and customer relationship solution provider, has raised an additional $6 million for its A.I.-powered software offering small businesses and alternative to mass blast emailing. To date, the startup has raised $12 million from investors including Tippet Venture Partners, Durham, N.C.-based Bull City Venture Partners, and angel investor Peter Gassner, the co-founder and CEO of Veeva Systems, and investor in Zoom.