happyDeliver is described as 'An open-source email deliverability testing platform that analyzes test emails and provides detailed deliverability reports with scoring' and is an app. There are four alternatives to happyDeliver for Web-based. The best happyDeliver alternative is DomainPreflight, which is both free and Open Source. Other great apps like happyDeliver are Unspam.email, Mailchecker and mail tester.
DomainPreflight checks everything that can silently break your email deliverability before you send a single message. Unlike MXToolbox which tells you what's wrong, DomainPreflight tells you exactly how to fix it — with copy-paste DNS records formatted for Cloudflare or...
Unspam.email is an online spam tester tool for emails. It helps to improve the deliverability and reputation of your email campaigns.
Mailchecker is a system that evaluates the quality of your email. It allows you to check whether a message will be perceived as valuable and likely reach your inbox, or rather treated as suspicious and sent directly to the SPAM folder or bounced by incoming server.
mail-tester.com is a free online service that allows you to test your emails for Spam, Malformed Content and Mail Server Configuration problems.
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