Based on our record, Topicbox 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 see they have a dedicated topicbox.com product for $20/month but I don't think I need that.. Just sharing part of an email account. I'm also open to a separate inbox of "shared" email, but that won't easily let you respond from your personal email.). Source: over 2 years ago
Spark Mail - Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues
Inbox Grader by Freshworks - Free metrics 📈 for your business and team email ✉️
TL;DR Email - Send short emails & read emails as fast as you read Facebook
Front - The platform for exceptional customer service at scale.
mlist - Email newsletters, outside of the inbox
Azendoo for Mobile - Shared tasks lists and team sync, on the go.