Followup.cc - FollowUp for email is a lightweight productivity suite that keeps your conversations and tasks from slipping through the cracks. Set perfectly timed reminders that arrive at the top of your inbox, right when you need them.
BlueMail - BlueMail is an email management app for Android, iOS, and Windows.
Gmelius - Gmelius is the first collaboration platform designed for G Suite and your company's daily tools.
Covideo - Covideo is a Video Email Platform for Businesses that enables companies to communicate quickly and effectively with their customers.
FollowUpThen - The simplest way to schedule an email reminder
Junk Email Filter - Junk Email Filter is a front end spam filtering and virus blocking service for email servers.