MailPier Inbox Terms of Service

Solutions Group Unlimited, LLC · Last updated 2026-11-11

These terms cover your use of MailPier Inbox, the hosted test-inbox service at app.mailpier.io and its API at api.mailpier.io, provided by Solutions Group Unlimited, LLC ("SGU", "we", "us"). By signing in, using an API key or sending mail to a MailPier Inbox address you accept them. If you accept them for a company, you confirm that you may do so for it, and "you" means that company.

1. The service

MailPier Inbox gives a team (a "workspace") email addresses that receive test mail, so the team can check the mail its own systems send, in the web inbox or through the API. It is a tool for testing and quality assurance. It is not a mailbox for real correspondence, an archive or a backup: mail is deleted automatically after a short time (see section 6).

2. Private beta

MailPier Inbox is in a private beta. Workspaces are set up by SGU, and use during the beta is free. During the beta we may change, limit or remove features, change quotas and limits, or end the beta, and there is no service level or uptime commitment. Where we reasonably can, we will tell workspace owners before a change that takes something away.

3. Accounts, members and API keys

Each workspace has owners and members. Owners decide who is a member, create and revoke API keys and choose the workspace's settings. You are responsible for those choices and for what your members and keys do.
You sign in with a one-time code sent to your email address. Keep your mailbox secure; anyone who can read it can sign in as you.
An API key gives full access to the workspace's mail. Keep keys secret, store them as secrets in your build or test system, and revoke a key at once if it may have leaked. We show a key only once and cannot recover it. Anything done with a key of your workspace is treated as done by you.
Tell us at once at the address below if you think someone has used your workspace or a key without permission.

4. Addresses, and who can see the mail

Your workspace receives mail at addresses of the form anything.<workspace>@<domain> on the domains we provide. There are no public inboxes: only your workspace's members and API keys can read your workspace's mail.
Anyone who knows or guesses one of your addresses can send mail to it. The addresses are not secret; do not rely on them to keep anything private.
The mail domains are shared by all workspaces and run by SGU. Mail sent to them is not private from SGU: our staff can see it while running, securing and supporting the service and when looking into abuse.

5. Acceptable use

Use MailPier Inbox only to receive test mail from systems you own or are allowed to test, and only with test data. You may not use it to:

receive mail meant for real people, or use an address as your own or anyone else's everyday mailbox;
sign up for, or create accounts on, third-party services without their permission, or to get around another service's sign-up limits, verification, anti-abuse or anti-fraud controls;
send, receive or support spam, phishing, malware, fraud or anything else unlawful, infringing, harassing or abusive;
receive regulated or sensitive data, such as health information (PHI), payment card data, government identifiers, passwords for real accounts, or real people's personal information beyond what your testing needs;
try to read another workspace's mail, get around sign-in, quotas or rate limits, or probe, scan or load-test the service without our written permission;
resell or provide the service to others without an agreement with us.

6. Quotas, limits and how long mail is kept

Each workspace has a monthly quota of received messages. Once it is used up, further mail to the workspace is refused until the next month. API keys are rate-limited, and other limits (for example on message size and the number of keys) apply. We may change quotas and limits.
Mail is kept for the workspace's retention time (12 hours at most, unless we agree otherwise in writing) and then deleted for good. You can delete mail sooner in the web inbox or through the API. Deleted mail cannot be recovered; save anything you need to keep in your own systems.

7. Your data

The test mail your workspace receives, and your test data in it, are yours. You give us permission to receive, store, check, display and delete it only to provide the service to you.
For that content we act on your behalf. You are responsible for what your systems send to your addresses and for having the right to send it.
How we handle personal information is described in the Privacy Policy.

8. Plans and payment (when paid plans start)

There is no charge during the private beta. When paid plans start, we will tell workspace owners in advance, and nothing is charged unless a workspace owner subscribes. From then on:

Plans are per workspace and billed monthly or annually in advance through Stripe, at the price shown when you subscribe, and renew until you cancel. We will never charge you without your agreement, given at checkout or when you confirm a plan change.

Payments are not refunded. You can cancel at any time: cancelling stops further billing, and the workspace stays on its paid plan until the end of the period you have paid for. The one exception is an annual plan that is cancelled early (email us to ask for it; see Contact below): the months used, the current month included, are charged at that plan's monthly price, the rest of the annual payment (if any) is refunded, and the workspace's paid plan ends at the end of that month.

An upgrade to a larger plan is charged the prorated difference for the rest of the current period at once. For a downgrade, the unused part of the period becomes a credit that is used for your next invoices; that credit stays a credit and is not paid out as a refund.

9. Availability and support

We work to keep MailPier Inbox available, but we do not guarantee uninterrupted service or that every message will be received unless we agree on it in writing. We may take it offline briefly for maintenance. For help, email the address below.

10. Ending or suspending

You may stop using MailPier Inbox at any time. To close a workspace, email us; we then delete its records as described in the Privacy Policy.
We may suspend or close a workspace, revoke its API keys, lower its limits, or refuse or delete mail sent to it, if it breaks these terms, is not paid for once paid plans start, or puts the service, other users or other people at risk. Where we reasonably can, we will warn you first and give you time to fix the problem; for abuse we may act at once.

11. No warranty

MailPier Inbox is provided "as is". To the extent the law allows, SGU gives no warranties, including of merchantability, fitness for a particular purpose and non-infringement.

12. Limit of liability

To the extent the law allows, SGU is not liable for indirect, incidental, special or consequential damages, or for lost profits or data (including mail that was not received or was deleted), and SGU's total liability to you for MailPier Inbox, for all claims together and however they arise, is US$0.

13. Governing law

These terms are governed by the laws of the State of Wyoming, USA, without regard to conflict-of-law rules. If a part of these terms cannot be enforced, the rest stays in force. These terms are the entire agreement about MailPier Inbox unless we sign a separate agreement with you.

14. Changes to these terms

If we change these terms we will update the date at the top of this page. During the free beta a change applies once it is published here; for a paid plan, a change applies from your next renewal.

Contact

Solutions Group Unlimited, LLC
Email: support@solutionsgroupunlimited.com