Forward Email is described as 'free and open-source email forwarding service focused on a user's right to privacy. It offers unlimited custom domain names, email addresses and aliases, disposable email addresses, spam and phishing protection, and other features' and is an app. There are three alternatives to Forward Email for Online / Web-based and Self-Hosted solutions. The best alternative is ImprovMX.com, which is free. Other great apps like Forward Email are Mailwhale and ForwardMX.io.