MailerSend
Knowledge base

Sandbox mode and the Professional trial

When you sign up, we'll offer you a choice: start your free 14-day Professional trial by adding a payment method, giving you full access to send to real recipients and Professional features, or skip this and try Sandbox mode instead. Here's what each one includes.

Sandbox mode

Sandbox mode is where you land if you skip the 14-day Professional trial. It's built for testing, not production sending. You get:

  • 100 emails a month, with a cap of 100 API requests a day

  • A trial domain you can use right away, or your own domain once verified

  • 1 domain (plus the trial domain), 1 API token, 1 webhook, 1 SMTP user and 1 template

  • Bulk emailing included

  • 1 day of activity data retention

You can only send to your own email address in Sandbox mode, the one you signed up with. This lets you see how your emails look and behave without any risk to real recipients. Sandbox mode is built for testing the basics rather than advanced features like request logs, custom headers, email verification, SMS or add-ons. If anything's unclear, our support team is happy to help by email.

There's no time limit, so you can stay in Sandbox mode for as long as you like. Ready to move on? Click Start 14-day trial in the banner at the top of your dashboard (card verification only, no charge), or click the Upgrade now button to subscribe to a plan directly.

Sandbox mode banner offering the user the option to start a 14-day trial or upgrade to a plan

The Professional trial

If you're ready to test MailerSend with real recipients and the full feature set, you can start your 14-day Professional trial by adding a payment method and clicking Start free trial on the pop-up you'll see at signup or login.

The start your 14-day free trial pop-up

Already in Sandbox mode? You can redeem your trial anytime by clicking Start 14-day trial in the banner at the top of your dashboard.

Either way, we only use your payment method to verify it. You won't be charged during the trial, and if you don't upgrade before your 14 days are up, your account moves to the Free plan.

Once activated, your trial gives you nearly everything Professional includes:

The trial scales down a few things:

  • 500 emails a month and 100 API requests a day

  • 1 user seat (Professional includes unlimited seats)

  • 1 day of API log retention (Professional includes 7 days)

  • Add-ons and logo removal aren't included

You'll see a countdown in the sidebar showing how many days are left on your trial.

What happens when the trial ends?

If you haven't chosen a plan by the time your 14 days are up, your account moves to the Free plan. We only use your payment method to verify your card or PayPal account. You won't be charged automatically.

If any of your resources, domains, API tokens, SMTP users and more, exceed the limits of your new plan, we'll ask you to choose which ones to keep active. Domains you don't select are paused rather than removed, so you can reactivate them if you upgrade again later.

Can I start a new trial after my current one ends?

Each customer can activate one Professional trial. Creating a new account won't unlock a second one.

Need more info?

Please feel free to contact us at support@mailersend.com and a member of our support team will gladly assist you.