MailGenius

MailGenius provides free email spam testing that checks deliverability and spam score. The platform verifies SPF, DKIM, and DMARC authentication, checks against 100+ DNS-based blacklists, reviews HTML structure for spam triggers, and analyzes subject line optimization. Premium features include automatic inbox testing, AI deliverability consultant, and advanced analytics. MailGenius users test over 1M emails per year. Founded and owned by Troy Ericson, who has generated over $200M for clients since 2020.