Carroway Researchhttps://carrowayresearch.com/Research notes on outbound, lead lists, events and sponsorships. Every note ships with its method and downloadable data.35.5% of US small-business email addresses are on free providers like Gmail and Yahoohttps://carrowayresearch.com/reports/business-email-domains-by-professionhttps://carrowayresearch.com/reports/business-email-domains-by-professionWed, 23 Sep 2026 12:00:00 GMTWe counted 559,231 business email addresses across 33 professions. Hair salons are highest at 67.7%. Financial advisors are lowest at 4.3%.