testmail.app is described as 'QA tool for automating end-to-end email tests. Get unlimited private email addresses and inboxes for testing new user signups, transactional emails and drip campaigns, deliverability and spam scores, etc. Integrates with your CI/CD workflow. Includes spam testing' and is a automated testing tool in the development category. There are more than 25 alternatives to testmail.app for a variety of platforms, including Web-based, Windows, Linux, Mac and SaaS apps. The best testmail.app alternative is Mailpit, which is both free and Open Source. Other great apps like testmail.app are Mailcatch.app, MailHog, MailMug.net and Mailtrap.
Mailsnag lets you build resilient SMTP integrations while protecting you from spamming customers during testing on QA and Staging environments. It is like Chaos Monkey for SMTP integrations.
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