Mailrelay is a marketing automation platform that helps businesses create email campaigns, track delivery and performance metrics, and monitor recipient response. OutReachBin is an email deliverability tool that helps marketers track how emails are being delivered and determine any potential sources of problems with deliverability. Mailrelay provides a range of marketing automation tools, including email campaigns and triggers, contact segmentation, and auto-responders. It also offers a wide range of analytics tools to monitor open rates, click-throughs, and other performance metrics. OutReachBin focuses more heavily on tracking delivery and determining where issues with delivery might be occurring. It monitors critical delivery data such as delivery rate, spam filters, IP reputation, bounce rates, and post-deliverability data. Additionally, OutReachBin also offers a wide range of additional features such as email authentication, blacklists, and ISP outreach. The key difference between Mailrelay and OutReachBin is that Mailrelay focuses more heavily on marketing automation capabilities, while OutReachBin focuses on email deliverability.