docNCRYPT - docNCRYPT is a cybersecurity platform which only focuses on its core services in protecting your email directly from the different email service provider and allows you to integrate your business email portal in the online service.
SpamHero - SpamHero is a professional spam filtering accuracy while lowering the cost to domain and business owners.
LuxSci - LuxSci providing HIPAA-compliant email, secure email & web services.
SpamAssassin - Use this program to "Unspam" your mailbox(es).
encryptomatic - encryptomatic is a smart email encryption software which provides tons of tools in encryption protocols for secure communication and business transaction.
SpamTitan - Comprehensive Email Protection. 99.99% Spam Detection. Blocks phishing, viruses, malware and other email threats.