ActiveInbox
Sanebox
Covideo
SpamTitan
MailCleaner
Vade Secure
ZeroSpam
Hornetsecurity Spamfilter
Followup.cc
FollowUpThen
Gmelius
Boomerang for Gmail
Right Inbox
Onesheet CRM
Mailbutler
SendRecurring
ActiveInbox Followup.ccBased on our record, Followup.cc seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I'll update this if I find more. For now, this seems to be a partial solution. It's a Gmail add on (except I don't use Gmail) that adds reminders. The options when setting reminders include cancelling it if someone replies, and to remind everyone in the thread. If you combine those two, it seems like — if you use Gmail's web client and have $23/month you're dying to get rid of — a decent way to add the feature. Source: over 1 year ago
Sanebox - SaneBox is a cloud-based service that allows users to filter and manage their emails.
FollowUpThen - The simplest way to schedule an email reminder
Covideo - Covideo is a Video Email Platform for Businesses that enables companies to communicate quickly and effectively with their customers.
Gmelius - Gmelius is the first collaboration platform designed for G Suite and your company's daily tools.
SpamTitan - Comprehensive Email Protection. 99.99% Spam Detection. Blocks phishing, viruses, malware and other email threats.
Boomerang for Gmail - Boomerang for Gmail is a Firefox / Chrome plugin that lets you take control of when you send and receive email messages.