Duobox

Terms and conditions

Last updated: 4 October 2026

These terms say what you get, what we charge you, and what we expect from you. They are written to be understood without a lawyer. If anything is unclear, write to legal@duobox.io.

1. Who provides the service

Duobox is the name of the service provided by MSN Computing LLC, a United States company, with offices at 1209 Mountain Road Place NE, STE N, Albuquerque, NM 87110, United States.

We say this up front because it is worth knowing before you pay: wherever your company is, you are contracting with a US company. Two concrete things follow, and both are below: the price is in US dollars (section 4), and the law and the court that settle a dispute are in the United States (section 16).

In this document, "Duobox" or "we" means MSN Computing LLC. "You" or "your company" means whoever opens the account and pays for the service.

These terms are the agreement between your company and us. When you create an account, you accept them. If there is a part you do not agree with, do not use the service.

Contact: legal@duobox.io.

2. What the service is

Duobox does two things: it registers internet domains, and it provides email on your company's domain.

How the email works:

  • An inbox is an address with its own history: sales@yourcompany.com, billing@yourcompany.com. The whole team can open it and work in it, and the history belongs to the inbox, not to the person who opened it.
  • An agent — a program that works for your company — can have its own address and its own permissions.
  • The domain can be bought through us; brought from another registrar, where you paste a few DNS records so the mail arrives here; or a subdomain of a domain you already use, so you do not touch the email you already have running.

What we do not do: we do not run your agent — that happens on your company's side — and we do not migrate the email you have with another provider for you.

3. How you sign up and how you cancel

You sign up by creating an account on the site. The plan is monthly, in US dollars, and it renews on its own every month until you cancel it.

You cancel from your account. On cancellation, the account goes back to what is included: one person, one inbox, one domain and 10 GB. Nothing you already created is deleted. What you cannot do is create more, and each inbox goes back to 10 GB of space.

Refunds: we do not issue them for now. You can cancel whenever you want and the service keeps running until the end of the period you already paid for; what you paid is not returned.

4. What the plan includes and what we charge

Included, no card: one person, one inbox, one domain and 10 GB.

What we charge:

  • Person: $2 a month, for each person beyond the first. Paying for a person also unlocks up to 10 inboxes for that person and 50 GB per inbox. The first person also becomes $2 the day she wants a second inbox or the 50 GB.
  • Extra domain: $5 a month, for each additional domain. The first one is included.
  • The agent is not billed. An agent is not a person and does not add to the price.

The domain name is paid separately: that price is not ours to set. It renews every year with the registrar, and if it is not renewed the domain expires and someone else can register it.

If you add or remove people or domains mid-month, the difference is prorated.

The amounts are in US dollars and do not include taxes. If a tax applies to this service in the country where your company is, it is added on top of these amounts and is on you.

5. Billing, renewal and a failed payment

Payments are processed by Stripe. Your card details are held by Stripe, not by us.

Every month the plan renews and the card on file is charged. Keep it current.

If a payment fails, you have seven days of grace. During those seven days the email keeps working exactly as before, and we tell you so you can update the card. If after seven days the payment still has not gone through, the account is restricted to what is included: nothing is deleted, but you cannot create more, and each inbox drops to 10 GB.

6. Inboxes, people or domains at no charge

Sometimes we grant inboxes, people or domains at no charge. We decide that, always with a recorded reason, and sometimes with an expiry date.

When one of those expires, nothing you already created is deleted. What stops is creating more: if you had three inboxes at no charge and the grant expires, the three are still there, but the fourth one is billed.

7. Price changes and changes to these terms

If we change the price, we tell the account administrator by email three months in advance. If the new price does not work for you, cancel before it takes effect.

If we change these terms, we publish the new version on this page with its date. If the change is significant, we also tell you by email. Continuing to use the service after the change takes effect means accepting the new version.

8. Your account, your passwords and who answers for them

Whoever opens the account administers it. That person chooses who gets in, to which inbox and with which permissions; answers for what the people and the agents on the account do; and keeps the contact email current, because that is where we send notices about payments and changes.

Passwords and API keys — the key an agent uses to connect — belong to your company and are secret. An API key is shown only once, when it is created. If it is lost or leaked, revoke it and create another one: revoking cuts the agent's access immediately.

If you think someone got into your account without permission, change the passwords and write to legal@duobox.io.

9. Acceptable use, and why the email rule is a hard one

You may not use Duobox to:

  • send unsolicited bulk email, that is, spam;
  • send to bought, rented or scraped lists instead of people who asked to hear from you;
  • impersonate another person or company, forge the sender, or pose as a domain that is not yours;
  • run phishing, scams, malware or anything illegal where you operate;
  • work around the account's technical limits, for example by opening several accounts to dodge a cap.

The reason is not good manners. All mail leaving Duobox shares sending reputation. If one account sends spam, the receiving providers — Gmail, Outlook and the rest — start sending to spam or rejecting mail from every one of our customers. The rule exists so that your mail gets delivered.

That is why we can set sending limits, ask you for an explanation, and suspend an account that is burning the sending reputation. When that happens, we tell you what we saw.

10. Your domain is yours

If you bought the domain through us, it is registered in your company's name. It is yours, not ours, and if you leave you take it with you.

How: you request the transfer to another registrar and, if the domain is paid up, we give you what the transfer needs — unlocking the domain and handing you the authorization code. The steps and the timing of a transfer are set by the domain's ending (.com, .com.ar, .io), not by us.

If you brought the domain from somewhere else, it was never ours: you remove the DNS records pointing the mail to Duobox and the domain stays where it was, with the provider you already had.

If you were using a subdomain, it hangs off a domain that is already yours: you stop pointing it at Duobox and that is it.

11. Agents, and who answers for what they send

An agent can have an address on your company's domain and send email from it.

Who answers: your company. Everything that leaves an address on your domain belongs to your company, whether a person or an agent wrote it. If an agent sends something it should not have sent, the company whose account it came from answers for it.

We say it that plainly because the agent does not run on our side. It runs on your company's side: you configure it and you grant its permissions. We provide the address, the permissions and the record of what it did.

How we keep the risk down:

  • An agent starts with Draft permission: it can read and prepare drafts, it cannot send. For it to send, someone at your company has to grant Send permission by hand.
  • The three levels are Read, Draft and Send, and they are enforced on the server, not in the program you run.
  • Every action taken with an API key is logged — date, agent, action, message — and can be seen in the account's administration.

One risk worth knowing about: an incoming email can be written to give the agent orders. Someone sends a well-worded message and the agent, if it has send permission, does something nobody at your company asked for. That is why send permission is granted by hand, and why it is worth reviewing which agents have it.

12. Service availability

We work to keep the email running at all times, but we do not promise it will never fail. These terms do not include a guaranteed uptime percentage.

Some parts depend on third parties we do not control: the DNS of the domain you brought, your internet connection, the providers that receive your mail, the domain registrar, and Stripe for payments.

We may also take the service down for maintenance. When it can be foreseen, we tell you beforehand.

The service is provided as it is and as it is available at any given time.

13. Stored email and closing the account

The email in your inboxes belongs to your company. You can download it while the account is open.

If the account is closed — because you ask for it or because we close it for a breach — download your mail first. Once the account is closed the stored email is deleted, and once deleted we cannot recover it. Closures are requested at legal@duobox.io.

Cancelling is not closing. If you cancel the paid plan, the account still exists with what is included, and the email is still there.

14. Limit of liability

We answer for what we get wrong, up to a limit.

We do not answer for: business you lost, profit you expected, a message that did not arrive or arrived late, email deleted by someone at your company, what the agent you configured does, or what a third party does — the registrar, your internet provider, the provider that receives your mail, Stripe.

We do not set a cap. If we get it wrong and that causes you harm, we answer for it.

If the law that applies to you does not allow limiting some of this, that part does not apply and the rest still stands.

15. Suspension and termination for breach

We can suspend or close an account if: payment does not come through after the seven days of grace; the acceptable use in section 9 is broken; the service is used for something illegal; or the service of our other customers is put at risk.

When we can, we tell you first and give you time to fix it. If the problem is urgent — spam going out right now, for instance — we suspend first and explain afterwards, by email to the account administrator.

Suspending deletes nothing. Closing does, after the period in section 13.

16. Governing law and jurisdiction

These terms are governed by the law of the State of New Mexico, United States, and its courts, and any dispute is settled before the courts of that place.

Plainly: if your company is in Argentina, Brazil or anywhere else in the region, litigating in New Mexico is expensive and slow. So the first route, always, is to write to legal@duobox.io. Most things get sorted out by email, and that suits both of us.

Anything unclear? Write to legal@duobox.io.