Apps similar to MailSlurp: Developer Email API include Mailinator, which has a free version. Other options are MailGrab, OpenMail, Mailcatch.app and Gigainbox.com. Disposable Email Services like MailSlurp: Developer Email API are a crowded field, with more than 25 alternatives for the web and self-hosting.
Mailinator is a throwaway email service that lets you use the @mailinator.com email domain to receive email at no cost. The email is publicly accessible by anyone but it's also easily disposable. With this, you can signup for services to try them out and not have to worry...
United States
Debug your emails. Drop MailGrab's SMTP into your staging .env. Every email your app fires — welcome messages, password resets, invoices — shows up here instead. HTML rendered, headers readable, nothing reaches real inboxes.
OpenMail gives AI agents their own email address - and everything that comes with it. Send a message, wait for a reply, act on what comes back. No human relay, no custom infrastructure. Just agents that can communicate with the world the same way people do.
Lithuania
EU
An email sandbox to inspect and debug emails in dev, staging, and QA environments before sending them to recipients in production.
United Kingdom
Protect your personal email address from spam with gigainbox.com - the disposable temporary email service that you love
Mailtrap is an Email Delivery Platform for businesses and individuals to Test, Send, and Control their email infrastructure performance.
PolandEU
Capture SMTP traffic from staging and dev environments. Easily validate email content text or HTML/CSS. Utilize an Email Sandbox to thoroughly examine and troubleshoot emails within staging, development, and quality assurance (QA) environments prior to sending them to recipients...
EmailVoid is email message receive service that provides API to check that message reaches your expectation.
Ikahana is a service that allows to receive email at a temporary address that self-destructed after a certain time elapses. It is also known by names like : temporary email, disposable email or throwaway email.
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.
United Kingdom
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.
testmail.app is an email testing platform for developers and QA teams. Create unlimited test email addresses on the fly using namespaces and tags, with no inbox setup required. Tags make it easy to isolate emails between users and parallel test runs.
