OpenE2EE Signal Protocol Relay Service Limits
The operating boundary for capacity, support, and service commitments.
The Relay terms incorporate this document. The permanent copy of this version is at /legal/relay-service-limits/2026-10-05.
Service status
Relay is generally available. The Sandbox environment and Free production plan have no service-level agreement. Paid-plan support and operational controls are those shown in the order. No uptime credit, response-time commitment, data residency promise, BAA, or production recovery objective applies unless a signed order form states it.
Plan and protocol limits
The current plan capacities and exact meter definitions are at Relay pricing. All plans support the same Relay protocol capabilities. A plan does not unlock or remove groups, attachments, sealed sender, multi-device delivery, or push wakes.
- Direct encrypted envelope: 256 KiB maximum.
- Mailbox: 3,000 accepted messages maximum.
- Group encrypted body: 96 KiB plus a 512-byte prefix.
- Group delivery: up to 5,000 destination devices in 100-destination fan-out pages.
- Attachment upload URL: never more than 15 minutes. The current window is shorter.
- Completed attachment retention: 30 days maximum.
Capacity and change control
A hard cap rejects new work without changing already accepted encrypted content. OpenE2EE can reduce abusive or unsafe traffic, repair a service incident, or change operating limits at any time by publishing a new version of this page. Section 3.9 of the Relay Service Terms governs a change to a paid plan’s price or included quantities.