Terms of Service
Effective April 16, 2026
By enrolling a DID and sending mail through the Atmosphere Mail relay, you agree to these terms.
What this is
Atmosphere Mail is a cooperative SMTP submission relay operated by Atmosphere Mail LLC ("we", "us"). It accepts authenticated mail from members whose identity is verified via atproto DIDs, signs outbound mail with DKIM, and delivers it to recipient MTAs. The service is provided free of charge and on a best-effort basis to support the atproto ecosystem.
Eligibility and authentication
To enroll you must prove control of both a DID and the domain you intend to send from. We verify domain ownership via a DNS TXT record — the same primitive used by Let's Encrypt and Google Workspace. You are responsible for safeguarding the API key issued at enrollment. We may revoke access if your DID, domain, or handle is lost, transferred, or disputed.
What you may send
Use of the relay is subject to our Acceptable Use Policy. Send only your own mail, to recipients who asked for it, and honor unsubscribe requests. Violating the AUP can result in throttling, labeling, or suspension without notice.
Service provided "AS IS"
THE SERVICE IS PROVIDED AS IS AND AS AVAILABLE, WITHOUT WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, OR UNINTERRUPTED OPERATION. We do not warrant that mail submitted through the relay will be accepted, delivered, or placed in any particular inbox folder.
Limitation of liability
TO THE MAXIMUM EXTENT PERMITTED BY LAW, Atmosphere Mail LLC and its members, officers, and contributors WILL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, OR FOR LOST PROFITS, REVENUE, BUSINESS, OR REPUTATION, ARISING OUT OF OR IN CONNECTION WITH YOUR USE OF THE SERVICE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Our aggregate liability for any claim arising out of or relating to the service is limited to one hundred U.S. dollars ($100).
Ending the relationship
You may stop using the relay at any time by contacting postmaster@atmos.email to have your member record and domain entries removed. We may suspend or terminate access for any reason, including AUP violations, legal requirements, or discontinuation of the service. Upon termination we will stop accepting mail from your DID; terminal message logs are retained under the retention schedule disclosed in the Privacy Policy.
Updates to these terms
We may update these terms as the service evolves. Material changes will be reflected here with a new effective date. Continued use of the relay after an update means you accept the revised terms.
Jurisdiction
These terms are governed by the laws of the State of Washington, United States, without regard to its conflicts of law rules. Any dispute that cannot be resolved by correspondence with postmaster@atmos.email will be heard in the state or federal courts sitting in King County, Washington.
Reach us
Atmosphere Mail LLC — postmaster@atmos.email. For abuse reports use abuse@atmos.email.