Email testing made simple.
Designed for developers.

Mailisk is a blazingly fast email testing platform focused on simplicity and privacy.
Get unique subdomains and gain access to unlimited email addresses.

namespace view

How does it work?

Send an email to your Mailisk address – we handle it

You can then access it via the API

describe("Test receive email", () => {
  const namespace = "mynamespace";
  const testEmailAddress = `test@${namespace}`;

  it("Gets an email", () => {

    cy.mailiskSearchInbox(namespace, {
      to_addr_prefix: testEmailAddr,
      subject_includes: "testing",
    }).then((response) => {
      const email =[0];
Test email flows

Integrate Mailisk with testing frameworks like Cypress and Selenium, easily test the whole user flow. From email verifications to passwordless sign-ins.

Test email delivery and ensure transactional and drip emails arrive where they need to.

Virtual inboxes

Receive and test emails without sending them to real users. With unlimited email addresses you can test real automations with no risk of the emails going to real users.

Preview emails directly

Never worry about how the received emails will look in the users inbox, preview them right in the dashboard. Skip sending test emails to yourself.

Why Mailisk?

We value simplicity, functionality, and privacy in email testing. Looking to automate your email tests? Mailisk has what you need. We only focus on key features, ensuring value and data security.

Easy to use

We believe in minimal yet functional design. Simplicity and ease of use is our main feature.

E2E email testing

Integrate with testing frameworks like Cypress. Test the whole user flow, from email verifications to password-less signings.


Emails are short-lived and stored on EU servers, ensuring data minimization and privacy for your tests.

Virtual SMTP

Send test emails directly with Mailisk. No need to use a 3rd party integration for sending test emails.

Blazingly fast

Our architecture is designed to process emails quickly. You'll receive emails as soon as they're sent.

Unique subdomain

Get your own unique subdomain and get access to unlimited email addresses.


Mailisk has a simple and transparent pricing system. No credit card required.
Start for free and then scale as you need.

Monthly emails500
Monthly billingYearly billing2 months free
Custom subdomains1 day email retention1 namespacesUnlimited team membersUnlimited email addressesFull API access

Frequently Asked Questions

What are namespaces?

Namespaces are unique subdomains under which you can receive emails. Every free user gets one random namespace, paid users can choose custom namespaces.­An example of a namespace is hello@{namespace} You can read more about namespaces here.

What happens when a namespace expires on the free plan?

On the free plan, namespaces are set to expire after one month. After expiration, free users will have to create a new random namespace. Once a namespace expires, all associated emails and data are deleted.

What happens if I go over the monthly limit?

Paid plans can have temporary egress without any hard limits. If you frequently exceed your monthly usage we will reach out.

What email limitations are there?

The maximum email size is 10MB. Emails larger than this are rejected. If you feel your use case needs a higher email size limit, please reach out.

Can I send outbound emails?

Yes, Mailisk supports sending emails using our Virtual SMTP servers. The emails can be sent to any valid mailisk address within the same namespace.

Ready to start testing emails?
Create a free account.

Get started