Rebump - Email Follow Up vs. Knock

Automated Email Follow-up Made Easy! Rebump sends multiple follow-up email messages to your recipients for you. These automated emails are customized to appear as if you sent the follow up yourself. You can track and analyze all of your follow-up emails with your Rebump account. Now includes email tracking. For Gmail or G Suite (Google Apps).

Knock is infrastructure for sending product and customer messaging. Ship cross-channel product notifications and lifecycle messaging that drives engagement, growth, and retention. Knock has everything you need to power notifications for your product, including: - A powerful workflow engine to automate and manage your entire cross-channel motion, from in-product messaging to email and push notifications. - Branded, in-product messaging components, including embeddable inboxes, feeds, and lifecycle messages. - Broadcasts make it easy to send effective, one-time messages to custom audiences.