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Stalwart Labs aims to provide a robust and feature-rich mail server solution. However, sustaining long-term development for such a project requires significant financial resources. Currently, we do not have enough open-source sponsors to cover these costs fully.

To bridge this funding gap and ensure the developers can work full-time and exclusively on enhancing Stalwart Mail Server, we offer a paid Enterprise version. The revenue from the Enterprise version is crucial for maintaining the quality and progress of both the paid and open-source versions.

Moreover, having a paid Enterprise version directly benefits the open-source community. The continuous development funded by the Enterprise version allows us to introduce new features and improvements to the open-source version as well.

It's important to note that the community edition of Stalwart Mail Server already boasts more features than any other open-source or paid mail server solution available in the market. We are committed to maintaining and expanding this lead.

We invite you to become a sponsor if you wish to support the open-source development further and help us release more features as open source in the future. Your sponsorship can make a significant difference in the project's growth and sustainability. Thank you for your understanding and support.

Yes. At Stalwart Labs, we are committed to maintaining the integrity and accessibility of Stalwart Mail Server as an open-source project. We understand the concerns arising from past incidents where popular open-source projects have changed their licensing models or moved certain features behind a paywall. We want to assure our community that we have no intention of doing a "rug pull."

Stalwart Mail Server will remain under the AGPLv3 license, and we will not change any existing open-source features into paid ones. Our commitment to the open-source community is unwavering, and we promise to keep the current open-source version fully accessible and free.

Our paid Enterprise version exists solely to support the long-term sustainability and development of the project. It allows us to fund full-time development and ensure that Stalwart Mail Server continues to grow and improve. The open-source version will continue to receive updates, enhancements, and new features as part of our ongoing commitment.

We appreciate the trust and support of our users and contributors. If you have any questions or concerns, please feel free to reach out to us. Thank you for believing in Stalwart Mail Server and our mission to provide a powerful, open-source mail server solution.

Our Enterprise licensing for Stalwart Mail Server is designed to be flexible and scalable to meet the needs of various organizations. Licenses are sold on a per-mailbox basis, allowing you to purchase only what you need, and charges are applied yearly or monthly, providing a straightforward and predictable cost structure.

We offer a tiered pricing scheme, meaning the more mailboxes you license, the lower the cost per mailbox. For those who prefer an annual billing cycle, we provide attractive discounts as an incentive for yearly payments.

Once you purchase an Enterprise license, you will receive a license key. This key is used to activate the Enterprise features in Stalwart Mail Server, unlocking advanced functionality and premium support.

Enterprise licenses for Stalwart Mail Server are issued to a specific domain name and can be used in an unlimited number of servers. This licensing model provides flexibility for enterprises, as a single license can be utilized across multiple servers, provided they share the same registered domain name.

For example, if an Enterprise license is issued for *.example.org, it can be used seamlessly across multiple servers configured under this domain, such as mx1.example.org, mx2.example.org, up to any number of X.example.org servers. This setup allows for robust, distributed deployment without requiring additional licenses for each server, as long as they fall under the specified domain.

Although licenses are issued to a specific domain, it is still possible to host an unlimited number of client domains within the same environment. This means that even if your Enterprise license is registered for *.example.org, you can still provide email services for any number of other domains on the same server, such as foobar.org, test.org, or any other client domain.

The domain-specific restriction applies solely to the licensed servers’ domain names (e.g., the server hostnames). It does not limit the server's ability to manage and support a variety of client or user domains. This approach provides organizations with the freedom to scale their hosting capabilities, supporting multiple domains while maintaining compliance with the Enterprise license's terms for server deployment.

Upgrading to the Enterprise version of Stalwart Mail Server is a simple and fully automated process. We offer instant license issuance for clients who pay by credit card, allowing you to begin using Enterprise features immediately after purchase. To obtain an Enterprise license, visit the Stalwart Labs Licensing Portal at https://license.stalw.art/buy.

Once the purchase is complete, your license key will be available instantly, enabling you to access the full suite of Enterprise capabilities on Stalwart Mail Server without delay.

Yes, we offer a 30-day trial license for clients interested in testing the Enterprise features before committing to a subscription. To obtain a trial license, please visit the Stalwart Labs Licensing Portal at https://license.stalw.art/trial.

The trial license provides full access to all Enterprise features, giving you ample time to evaluate Stalwart Mail Server’s premium capabilities in your environment.

If you decide to cancel your Stalwart Enterprise Edition subscription, the server will automatically revert to the Community Edition. This transition will disable all Enterprise features but will not cause any data loss or interrupt the service. Your existing data and emails will remain intact and accessible, ensuring a seamless experience for your users without any disruption.