Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.
SpamTitan - Comprehensive Email Protection. 99.99% Spam Detection. Blocks phishing, viruses, malware and other email threats.
MailClark - The Slack bot for external communications
MailCleaner - Cloud & on-premise anti spam software for businesses
Nylas Mail - The Nylas Cloud API powers your application with email, calendar & contacts features. Built-in features for better email, calendar, and contact management.
Sanebox - SaneBox is a cloud-based service that allows users to filter and manage their emails.