ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
SpamTitan - Comprehensive Email Protection. 99.99% Spam Detection. Blocks phishing, viruses, malware and other email threats.
Sfletter - SFLetter.com protects your message and attachments by one click. Email protection from interception and unauthorized actions of the recipient.
MailCleaner - Cloud & on-premise anti spam software for businesses
Tutanota - Get your encrypted mailbox for free.
Vade Secure - Email security to protect against email-borne phishing, spear phishing, malware, and ransomware. Email security and management based on artificial intelligence.