MailSpons is described as 'Fake SMTP server for safe email testing. Stop accidentally spamming your customers' and is a Mail Server in the development category. There are more than 25 alternatives to MailSpons for a variety of platforms, including Web-based, Windows, Linux, Mac and SaaS apps. The best MailSpons alternative is Mailpit, which is both free and Open Source. Other great apps like MailSpons are Mailcatch.app, MailHog, MailMug.net and Mailtrap.
Email Testing for QA & Development Teams. Catch every email your product sends, analyze it's contents, follow links and test deliverability all via the Mailosaur API.
Mailosaur is the most popular commercial alternative to MailSpons.
Ethereal is a fake SMTP service, mostly aimed at Nodemailer users (but not limited to). It's a completely free anti-transactional email service where messages never get delivered.
Origami SMTP was created with the idea to have a fake email server for testing purposes that supported TLS. This is because the code the developer was working on at the time had several hard coded values enforcing TLS so most other solutions would not work.
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.
LunaticSMTP is a dummy SMTP server with desktop GUI for testing email sending applications.
MailDev is a simple way to test your project's generated emails during development with an easy to use web interface that runs on your machine built on top of Node.js.
MailDev is the most popular Self-Hosted alternative to MailSpons.
Mailnest is an all in one email QA tool for development & testing teams in IT companies to test & improve email functionality.
A local SMTP server with email display, used mostly for development of other apps. Think unlimited Mailtrap that runs on your own computer.
Imitate Email is a fake SMTP server for developers and testers. It includes an embeddable widget so that testers can quickly see sent emails alongside the app they're testing.
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.
DevMail is an email sandbox service for software developers. It allows developers to capture emails from various environments and inspect HTML, text, source code, raw headers, and attachments, and improve deliverability by analyzing email spam scores.
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