ActiveInbox VS MassMailer

Sanebox - SaneBox is a cloud-based service that allows users to filter and manage their emails.

Boomerang for Outlook - Boomerang for Outlook offers email productivity tools to track, schedule and send mails at the right time.

SpamTitan - Comprehensive Email Protection. 99.99% Spam Detection. Blocks phishing, viruses, malware and other email threats.

Covideo - Covideo is a Video Email Platform for Businesses that enables companies to communicate quickly and effectively with their customers.

Outlook4Gmail - Outlook4Gmail provides easy synchronization of your Outlook and Google accounts

Vade Secure - Email security to protect against email-borne phishing, spear phishing, malware, and ransomware. Email security and management based on artificial intelligence.