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filtermail rate limiter is using leaky bucket algorithm (GCRA). Exceeting the limit requires sending at least max_user_send_per_minute messages to exhaust allowed burst, and then sending messages faster than the leak rate. As we don't know how fast is the network between the server and test runner, try to send 3 times max_user_send_per_minute messages to ensure the test does not fail randomly.
Chatmail relays for end-to-end encrypted email
Chatmail relay servers are interoperable Mail Transport Agents (MTAs) designed for:
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Zero State: no private data or metadata collected, messages are auto-deleted, low disk usage
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Instant/Realtime: sub-second message delivery, realtime P2P streaming, privacy-preserving Push Notifications for Apple, Google, and Huawei;
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Security Enforcement: only strict TLS, DKIM and OpenPGP with minimized metadata accepted
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Reliable Federation and Decentralization: No spam or IP reputation checks, federating depends on established IETF standards and protocols.
This repository contains everything needed to setup a ready-to-use chatmail relay on an ssh-reachable host. For getting started and more information please refer to the web version of this repositories' documentation at