Terms of Service

1. Acceptance

By using the MailFlow website (mailflow.sh) or purchasing a MailFlow commercial license, business license, support plan or partner plan, you agree to these Terms. If you do not agree, do not use the site or make a purchase.

mailflow.sh and MailFlow are run by Matthias (MailFlow), New York, USA ("we"). Purchases are sold by Paddle.com, our Merchant of Record, as described in section 4.

2. The Software

MailFlow is self-hosted, open-source software distributed under the AGPL-3.0 license. Self-hosting MailFlow under the AGPL-3.0 is free for anyone, individuals and businesses alike. The commercial license described in section 3 is for running a modified MailFlow without publishing your changes under the AGPL-3.0. The software is provided as-is, without warranty of any kind.

We do not operate a hosted version of MailFlow. You are responsible for your own deployment, server security, backups, and data.

3. Commercial License (private modifications license)

The commercial license, listed on mailflow.sh as the private modifications license, lets a business run a modified MailFlow without publishing its changes under the AGPL-3.0. It costs $500 per installation, one-time, plus tax. Its full terms are in the MailFlow Commercial License. This section is a summary; if it and the license differ, the license governs.

• One license covers one installation, and it can't be transferred or resold.
• It covers later versions of MailFlow at no extra cost.
• It doesn't cover offering MailFlow to third parties as a hosted service. Providers need separate written terms (see section 3c).
• A refunded license ends.

3a. Business License

The business license is a voluntary yearly payment toward MailFlow's development: $100 per instance per year, plus tax. MailFlow remains free to use under the AGPL-3.0, and the software does not check whether you have one.

• The business license grants no rights beyond those of the AGPL-3.0. To run a modified MailFlow without publishing your changes, see the Commercial License in section 3.
• The business license renews every year until canceled. You can cancel from the link in your Paddle receipt email, or by emailing contact@mailflow.sh. Canceling stops future renewals.
• If the price changes, we will email you at least 30 days before the new price applies at your next renewal.
• GitHub issues opened by business license holders are looked at first. Email contact@mailflow.sh with your GitHub username to be added. This sets the order we look at issues in; it is not a guaranteed response time.
• If your company needs a quote, an invoice before payment or a purchase order, email contact@mailflow.sh.
• Refunds follow our Refund Policy.
• Payments are processed by Paddle, who acts as Merchant of Record, as described in section 4.

3b. Business Support

Business support plans are yearly and agreed in writing with each customer, including scope, price and response times. A support plan includes a business license for the instances it covers. Support plans don't change the license MailFlow is used under.

3c. Provider Partners

Hosting providers and managed service providers (MSPs) that offer MailFlow to their customers can become provider partners under a written agreement.

• MSP plans cover a set number of client instances, count as business licenses for those instances, and are billed yearly through Paddle invoices, plus tax. Hosting partners pay an agreed share of their MailFlow revenue.
• Partners are listed on mailflow.sh and in the README as places to get MailFlow. A listing is not an endorsement, and we may remove it at any time.
• Partners get an email before each security release with its date and severity. The fix itself is published to everyone at the same time.
• Partners support their own customers. We support the partner, not the partner's customers, and we offer no guaranteed response times.
• Partner plans grant no rights beyond the AGPL-3.0. Offering a modified MailFlow to customers without publishing the changes requires separate written terms.

4. Payments

Payments are processed by Paddle, who acts as Merchant of Record. All billing disputes are subject to Paddle's terms. See our Refund Policy for details on refunds.

5. Disclaimer of Warranties

MailFlow is provided "as is" without warranty of any kind, express or implied, including but not limited to warranties of merchantability, fitness for a particular purpose, or non-infringement. We make no guarantees that the software will be error-free, uninterrupted, or free of security vulnerabilities.

6. Limitation of Liability

To the maximum extent permitted by law, MailFlow and its author shall not be liable for any indirect, incidental, special, or consequential damages arising from your use of the software or website, including but not limited to loss of data, loss of revenue, or security breaches of your self-hosted instance.

7. Changes to These Terms

We may update these Terms from time to time. Changes will be posted on this page with an updated date. Continued use of the site, or a purchase made after a change, constitutes acceptance. Changes do not alter a purchase already made.

8. Governing Law

These Terms are governed by the laws of the State of New York, USA, without regard to its conflict of law rules. Any disputes shall be resolved in the state or federal courts located in the State of New York. Nothing in these Terms limits consumer rights you have under the laws of the country where you live.

9. Contact

Questions about these Terms? Email contact@mailflow.sh.